This patch adds the validation on the creation of the bind group
layout with read-only storage texture, write-only storage texture
and read-write storage texture. Currently read-write storage textures
are not supported in any shader stages.
This patch also fixes chromium:1061156.
BUG=chromium:1061156, dawn:267
TEST=dawn_unittests, dawn_end2end_tests
Change-Id: Ib42678719df48565a46e39f21c34ec640960dcdc
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16920
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Now that all backends use slab-allocated bind groups, this patch also
moves the BindGroup implementation with owned-data into the Null backend.
Bug: dawn:340
Change-Id: I08a952075b382008fb82f1fbab3f779cc05bc2a3
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16747
Commit-Queue: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Track what heaps are required to be resident upon command list
submission.
Bug: dawn:193
Change-Id: Icefe5aed047140f401d51018937c5364b3ed7c4f
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16382
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
This patch adds the basic validation of read-only storage texture,
write-only storage texture and read-write storage texture as new
binding types with no bind group layout provided in the creation of
pipeline state objects.
- Read-only storage textures can be used in vertex, fragment and
compute shaders.
- Write-only storage textures can only be used in compute shaders
due to the limitation on Metal.
- Read-write storage textures are not allowed now and they are
reserved to be supported as an extension in the future.
BUG=dawn:267
TEST=dawn_unittests
Change-Id: Iffc432f29a855b85d59451cb3c50269e03b84627
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16661
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Rather than destory GPU descriptor heaps upon being switched out,
heaps are stored in a list where they can be re-used once the GPU
is no longer using them.
BUG=dawn:155
Change-Id: I2074573e354f114c45afe9895e8515980d325852
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16282
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Bryan Bernhart <bryan.bernhart@intel.com>
When creating a directly allocated resource in D3D12, also create a
dawn_native::d3d12::Heap to represent that allocation alongside the
ResourceHeapAllocation. This matches D3D12's allocation model when using
CreateCommittedResource and makes residency management much easier.
Bug: dawn:193
Change-Id: I2280863dcfca57bad72962a2b097f8f2d4cc7dad
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16381
Commit-Queue: Brandon Jones <brandon1.jones@intel.com>
Reviewed-by: Austin Eng <enga@chromium.org>
This patch intends to fix a crash issue when creating a rendering
pipeline with storage buffer declared in vertex shader and pipeline
layout is not set.
Without this patch, in PipelineLayoutBase::CreateDefault() the
bindingSlot.visibility is always set to Fragment and Compute when it is
a storage buffer, therefore a crash happens at the failure of the
assertion modules->IsCompatibleWithPipelineLayout() when the storage
buffer is actually declared in the vertex shader.
BUG=dawn:276
TEST=dawn_unittests
Change-Id: I56876a97d53ead5ed226dc1b9bbed1a77156b2b2
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16564
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
Use ExternalImageDescriptor->isCleared to set the clear status of
subresources so it can be correctly lazy cleared when used.
Also remove old Wrap path that uses regular texture descriptors
since we have moved to use ExternalImageDescriptor.
Bug: chromium:1036080
Change-Id: Icb605dbf3cf3f0dc8a30287e8b9b8d9134805112
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16320
Commit-Queue: Natasha Lee <natlee@microsoft.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
This reverts commit 4ae315b0d1.
Reason for revert: crbug.com/1059205
Bug: chromium:1059205
Original change's description:
> Vulkan: Report and enable subgroup size control device extension.
>
> Certain Vulkan ICDs (Intel ones notably) will compile SPIR-V
> shaders with an liberal, compiler-selected, subgroup size (i.e.
> either 8, 16 or 32). For more context, see [1].
>
> This can be a problem for compute, when one shader stores data
> in device memory using a subgroup-size dependent layout, to be
> consumed by a another shader. Problems arise when the compiler
> decides to compile both shaders with different subgroup sizes.
>
> To work-around this, the VK_EXT_subgroup_size_control device
> extension was introduced recently: it allows the device to
> report the min/max subgroup sizes it provides, and allows
> the Vulkan program to control the subgroup size precisely
> if it wants to.
>
> This patch adds support to the Vulkan backend to report and
> enable the extension if it is available. Note that:
>
> - The corresponding VkStructureType enum values and
> struct types are not rolled to the third-party Vulkan
> headers used by Dawn yet, so vulkan_platform.h has been
> modified to define them if necessary. This can be
> removed in the future when the Vulkan-Headers are
> updated in a different patch.
>
> - This modifies VulkanDeviceInfo::GatherDeviceInfo() to
> use VkGetPhysicalDevice{Properties2,Features2} if the
> VK_KHR_get_device_properties2 instance extension is
> available. Otherwise, the Vulkan 1.0 APIs
> VkGetPhysicalDevice{Properties,Features} are used instead
> (and it is assumed that no subgroup size control is
> possible).
>
> - This changes the definition of VulkanDeviceKnobs to
> make room for the required pNext-linked chains of
> extensions.
>
> - A helper class, PNextChainBuilder is also provided in
> UtilsVulkan.h to make it easy to build pNext-linked
> extension struct chains at runtime, as required when
> probing device propertires/features, or when
> creating a new VkDevice handle.
>
> Apart from that, there is no change in behaviour in this CL.
> I.e. a later CL might force a specific subgroup size for
> consistency, or introduce a new API to let Dawn clients
> select a fixed subgroup size.
>
> [1] https://bugs.freedesktop.org/show_bug.cgi?id=108875
>
> Change-Id: I524af6ff3479f25b0a8bb139a062fe632c826893
> Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16020
> Reviewed-by: Austin Eng <enga@chromium.org>
> Reviewed-by: Corentin Wallez <cwallez@chromium.org>
> Commit-Queue: Corentin Wallez <cwallez@chromium.org>
TBR=cwallez@google.com,cwallez@chromium.org,enga@chromium.org,enga@google.com,david.turner.dev@gmail.com
# Not skipping CQ checks because original CL landed > 1 day ago.
Change-Id: I893d771d7effdf83685dda3edac8a08f98d2f6e5
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16522
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
This reverts commit 56f1678437.
Reason for revert: crbug.com/1059205
Bug: chromium:1059205
Original change's description:
> Vulkan: Enforce fixed subgroup size for compute shaders.
>
> This CL ensures that, on architectures with a varying subgroup size,
> compute shaders are always compiled with a fixed subgroup size to
> avoid consistency issues when one shader writes data in a subgroup-size
> dependent layout to GPU memory, to be read by another shader in a
> future dispatch.
>
> At the moment, only Intel ICDs are known to implement this [1],
> and the code uses a heuristics to chose the size of 16, which seems to
> be the sweet spot according to Intel engineers.
>
> + Update the PNextChainBuilder class to deal with the fact that
> VkComputePipelineCreateInfo::pNext is defined as a const void*,
> which created compiler errors in the previous implementation.
>
> [1] https://bugs.freedesktop.org/show_bug.cgi?id=108875
>
> Change-Id: I332faa53b9f854a8abe43a7271f30d8c5deb2142
> Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16021
> Commit-Queue: Corentin Wallez <cwallez@chromium.org>
> Reviewed-by: Corentin Wallez <cwallez@chromium.org>
TBR=cwallez@google.com,cwallez@chromium.org,enga@chromium.org,enga@google.com,david.turner.dev@gmail.com
# Not skipping CQ checks because original CL landed > 1 day ago.
Change-Id: I922eccc310505da4b4a9fc853335733ca4900fc8
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16521
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
This matches Chromium's logic and make it less likely to break developer
workflow in the subsequent roll of Chromium's buildtools.
Bug: dawn:339
Change-Id: Ic42553827be125985a3d16b4f5d003b6662ead39
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16520
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
This CL ensures that, on architectures with a varying subgroup size,
compute shaders are always compiled with a fixed subgroup size to
avoid consistency issues when one shader writes data in a subgroup-size
dependent layout to GPU memory, to be read by another shader in a
future dispatch.
At the moment, only Intel ICDs are known to implement this [1],
and the code uses a heuristics to chose the size of 16, which seems to
be the sweet spot according to Intel engineers.
+ Update the PNextChainBuilder class to deal with the fact that
VkComputePipelineCreateInfo::pNext is defined as a const void*,
which created compiler errors in the previous implementation.
[1] https://bugs.freedesktop.org/show_bug.cgi?id=108875
Change-Id: I332faa53b9f854a8abe43a7271f30d8c5deb2142
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16021
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Certain Vulkan ICDs (Intel ones notably) will compile SPIR-V
shaders with an liberal, compiler-selected, subgroup size (i.e.
either 8, 16 or 32). For more context, see [1].
This can be a problem for compute, when one shader stores data
in device memory using a subgroup-size dependent layout, to be
consumed by a another shader. Problems arise when the compiler
decides to compile both shaders with different subgroup sizes.
To work-around this, the VK_EXT_subgroup_size_control device
extension was introduced recently: it allows the device to
report the min/max subgroup sizes it provides, and allows
the Vulkan program to control the subgroup size precisely
if it wants to.
This patch adds support to the Vulkan backend to report and
enable the extension if it is available. Note that:
- The corresponding VkStructureType enum values and
struct types are not rolled to the third-party Vulkan
headers used by Dawn yet, so vulkan_platform.h has been
modified to define them if necessary. This can be
removed in the future when the Vulkan-Headers are
updated in a different patch.
- This modifies VulkanDeviceInfo::GatherDeviceInfo() to
use VkGetPhysicalDevice{Properties2,Features2} if the
VK_KHR_get_device_properties2 instance extension is
available. Otherwise, the Vulkan 1.0 APIs
VkGetPhysicalDevice{Properties,Features} are used instead
(and it is assumed that no subgroup size control is
possible).
- This changes the definition of VulkanDeviceKnobs to
make room for the required pNext-linked chains of
extensions.
- A helper class, PNextChainBuilder is also provided in
UtilsVulkan.h to make it easy to build pNext-linked
extension struct chains at runtime, as required when
probing device propertires/features, or when
creating a new VkDevice handle.
Apart from that, there is no change in behaviour in this CL.
I.e. a later CL might force a specific subgroup size for
consistency, or introduce a new API to let Dawn clients
select a fixed subgroup size.
[1] https://bugs.freedesktop.org/show_bug.cgi?id=108875
Change-Id: I524af6ff3479f25b0a8bb139a062fe632c826893
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16020
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
A Chromium's LinkedList class to Dawn. Implementation and header are
a direct copy/paste. This is to be used to implement an LRU Cache
for the ResidencyManager class.
Bug: dawn:193
Change-Id: I7cb02649590be4db0fe54c9d80557ac49efc34de
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16380
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Instead of tracking RTV/DSVs before the start of the pass to allocate
memory for CPU descriptors, allocate them at the start of the pass,
removing the need to loop through the entire command buffer each
Submit().
BUG=dawn:256
Change-Id: I72faff8951095c6a45207bfe5b12936715c58abf
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16261
Commit-Queue: Bryan Bernhart <bryan.bernhart@intel.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Some dawn_unittests crash on some configurations because the
uninitialized |label| member crashed string serialization.
Default initialize all descriptors to avoid this problem.
Bug: none
Change-Id: I6ea1851ebb6f54690a28ba396e0beaa85d8670cc
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16260
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@google.com>
Commit-Queue: Austin Eng <enga@chromium.org>
This is so we can run the end2end_tests using Swiftshader. We still
prefer the discrete, then integrated GPUs so that normal testing uses
the real GPU.
Bug: dawn:283
Change-Id: I17a1ffd8aa88ddeaafa019feb67deeb25cdd2da0
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16220
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Mark Henderson <mehe@google.com>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
Instead of counting descriptors to be allocated for the entire command
buffer in a pre-pass, the bindgroup state tracker is used to allocate
only dirty bindgroups upon recording draw/dispatch. If the heap has no
more room and must be changed, bindgroups will be re-created according
to the BGL.
A future change will address the CPU descriptors and removal of the
pre-pass.
BUG=dawn:256,dawn:307
Change-Id: I6603de17cfda713bd4512c46e1c93618ca01bb7b
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/13400
Commit-Queue: Bryan Bernhart <bryan.bernhart@intel.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
These are not supported on some older OpenGL, OpenGL ES, and iOS
devices.
Bug: dawn:343
Change-Id: I70def749ae57fcfe2895f8556674dd241941d3d3
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16163
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Jiawei Shao <jiawei.shao@intel.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
This Toggle is set if MTLFeatureSet_iOS_GPUFamily3_v1 is not supported.
Bug: dawn:342
Change-Id: Ia5f43e87fdd2c13eaffe9557cb0ce9a06dec3b29
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16180
Reviewed-by: Jiawei Shao <jiawei.shao@intel.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
BUG=dawn:344
Change-Id: Ifa9e1e3167ecfe7d38c16f393cec0443ea1589f2
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16164
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
If these extern variables are initialized after DAWN_INSTANTIATE_TEST,
they will be zero. Change them to be function calls instead.
Since they're function calls, fold in arguments from ForceToggles to
enable/disable toggles.
Bug: dawn:341
Change-Id: I1aeaa1e535a0a003977e8ce7ab3d5278c5d81281
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16162
Reviewed-by: Mark Henderson <mehe@google.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
Roll third_party/SPIRV-Tools/ 4a80497a8..8910ea5f1 (4 commits)
4a80497a88..8910ea5f1c
$ git log 4a80497a8..8910ea5f1 --date=short --no-merges --format='%ad %ae %s'
2020-02-23 nicolasweber Fix Wrange-loop-analysis warnings in SPIRV-Tools. (#3201)
2020-02-21 geofflang Add missing dependencies when generating spvtools_core_tables (#3199)
2020-02-21 afdx Brief guide to writing a spirv-fuzz fuzzer pass (#3190)
2020-02-21 47594367+rg3igalia Fix ignored const qualifier warning in static_cast (#3197)
Roll third_party/glslang/ c12493ff6..07e1a0a67 (1 commit)
c12493ff69..07e1a0a67a
$ git log c12493ff6..07e1a0a67 --date=short --no-merges --format='%ad %ae %s'
2020-02-22 rex.xu Fix an issue of SPV generation for imageAtomicStore.
Roll third_party/shaderc/ 738f1655a..1059f43a3 (1 commit)
$ git log 738f1655a..1059f43a3 --date=short --no-merges --format='%ad %ae %s'
2020-02-21 rharrison Rolling 6 dependencies and update expectations (#987)
Roll third_party/spirv-cross/ f19fdb94d..c5f7b5575 (5 commits)
f19fdb94d7..c5f7b55756
$ git log f19fdb94d..c5f7b5575 --date=short --no-merges --format='%ad %ae %s'
2020-02-24 post MSL: Add C API for force native arrays.
2020-02-24 post MSL: Add native array test for composite array initialization.
2020-02-24 post MSL: Reintroduce workaround for constant arrays being passed by value.
2020-02-24 post MSL: Reinstate workaround for returning arrays.
2020-02-24 post MSL: Add a workaround path to force native arrays for everything.
Created with:
roll-dep third_party/SPIRV-Tools third_party/glslang third_party/shaderc third_party/spirv-cross third_party/spirv-headers
Change-Id: Ic9f459c21a9656093b5ec27e19f0744182734c7c
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16120
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Previously we would always assume that if the driver supported a Vulkan
version it would also support extensions that were promoted in that
version. This is not a spec requirement, so instead try to load the core
entrypoints, and only if the version is not available, load the
extension entrypoints.
Also renames VulkanFunction members that are from promoted extension to
not have a vendor prefix.
Also tag the promoted extensions that are the same in a core version as
available when that core version is available. This simplifies checking
for features in the Vulkan backend.
Bug:
Change-Id: I0817c01b8838ba26070858abb0cbed030e3291df
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16040
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: David Turner <digit@google.com>
This relands commit 0bbfec1f7f which
was reverted in 21e5074dcd.
The original CL broke the Chromium roll because drm/drm_fourcc.h
could not be found. Still not sure why this is the case since it
seems to be present on all of my CrOS test machines, but at the end
of the day, I realized that I don't even need this header in the
first place.
This CL removes the header and relands the rest of the original CL.
Bug: chromium:996470
Change-Id: I77d6b1692094b7798f3c5d9c2b50219e674c8a8c
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16060
Commit-Queue: Brian Ho <hob@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
This reverts commit 0bbfec1f7f.
Reason for revert: Makes the roll into Chromium fail with the following:
[314/21578] CXX obj/third_party/dawn/dawn_white_box_tests_sources/VulkanImageWrappingTestsDmaBuf.o
FAILED: obj/third_party/dawn/dawn_white_box_tests_sources/VulkanImageWrappingTestsDmaBuf.o
../../build/toolchain/clang_code_coverage_wrapper.py --target-os=chromeos --files-to-instrument=../....(too long)
../../third_party/dawn/src/tests/white_box/VulkanImageWrappingTestsDmaBuf.cpp:28:10: fatal error: 'drm/drm_fourcc.h' file not found
#include <drm/drm_fourcc.h>
^~~~~~~~~~~~~~~~~~
1 error generated.
Original change's description:
> Create VulkanImageWrappingTests for dma-buf images
>
> This CL branches the existing VulkanImageWrappingTests to separate
> tests for OpaqueFD-backed amd DmaBuf-backed external images. On
> Chrome OS of Dawn, we no longer interop using opaque FDs, so these
> tests were failing in the end2end test suite.
>
> The new VulkanImageWrappingTestsDmaBuf tests are essentially 1:1
> mappings of their counterparts in the Opaque FD version. The only
> difference is that we allocate memory directly on the device using
> GBM instead of creating a VkImage (which will likely call some GBM
> methods under the hood) and then extracting the FD using a Vulkan
> extension. We then communicate this to Dawn via the DmaBuf
> ExternalImageDescriptor.
>
> Also, this fixes VulkanImageWrappingUsageTests::LargeImage on AMD
> devices (assuming the extension is implemented) as we can now
> specify DRM modifiers.
>
> Bug: chromium:996470
> Change-Id: I2b3c57d7f5ff14131d415e99a09d32d2f16b3e54
> Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/15800
> Commit-Queue: Brian Ho <hob@chromium.org>
> Reviewed-by: Austin Eng <enga@chromium.org>
TBR=cwallez@chromium.org,enga@chromium.org,hob@chromium.org
Change-Id: Idb45586c608ce20432142834a4f14d42c76d3b3b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:996470
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16001
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
This CL branches the existing VulkanImageWrappingTests to separate
tests for OpaqueFD-backed amd DmaBuf-backed external images. On
Chrome OS of Dawn, we no longer interop using opaque FDs, so these
tests were failing in the end2end test suite.
The new VulkanImageWrappingTestsDmaBuf tests are essentially 1:1
mappings of their counterparts in the Opaque FD version. The only
difference is that we allocate memory directly on the device using
GBM instead of creating a VkImage (which will likely call some GBM
methods under the hood) and then extracting the FD using a Vulkan
extension. We then communicate this to Dawn via the DmaBuf
ExternalImageDescriptor.
Also, this fixes VulkanImageWrappingUsageTests::LargeImage on AMD
devices (assuming the extension is implemented) as we can now
specify DRM modifiers.
Bug: chromium:996470
Change-Id: I2b3c57d7f5ff14131d415e99a09d32d2f16b3e54
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/15800
Commit-Queue: Brian Ho <hob@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>