What was previously the Device's loss status is now a state that also
contains the "being created" state. Its transitions are entirely
handled in the frontend which enforces somewhat uniform lifecycles
between backends.
The backend devices' ShutDownImpl() function is now guaranteed to be
called only during the destructor, which leads to further simplification.
Previously Destroy() could also be called when the device was first
lost. This require complications because, for example, a WGPUBuffer
could still exist, and would want to call some resource allocator
service after the call to Destroy(). Now destruction of the device's
backing API objects is deferred to the destructor. (that's ok as long
as the application can't submit any more work).
WaitForCompletion is now guaranteed to be called before ShutDownImpl() iff
the call to DeviceBase::Initialize was succesful and the backing device
not lost. The idea is that after DeviceBase::Initialize, the GPU can
have some work enqueued and we need to wait for it to complete before
deleting backing API objects. In the future we might also have backend
be reentrant, using WebGPU itself to implement parts of the backend.
Reentrant calls would only be allowed after DeviceBase::Initialize.
Also the DynamicUploader that was special-cased in all backends is
now handled entirely by the frontend.
Bug: dawn:373
Change-Id: I985417d67727ea3bc11849c999c5ef0e02403223
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18801
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
To do perfect forwarding of GN targets, the proper method is to make a
group with public_deps. For example in the following:
- Config C
- Target T with a public_deps including C
- Group G that proxies B
- Target T2 that depends on G
If G uses deps = [ T ] then T2 won't see C, whereas if G uses
public_deps = [ T ] then T2 will dep on T, which will make it dep on C.
Bug: chromium:1064305
Change-Id: Iae236150c119b1a4003b957dcacf42e7759a936c
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18965
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
This helps take advantage of the GN feature where when a directory is
used as a target name, like //foo/bar/baz, the //foo/bar/baz:baz target
is used automatically.
Bug: chromium:1064305
Change-Id: I2e2d9f308fda1b811482026962ab0770ac45e988
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18862
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
This will help external projects that want to use Dawn, like Skia, refer
to GN targets without GN discovering Dawn's main BUILD.gn file that
causes all the tests and third_party dependencies to be discovered.
This CL just splits off chunks of BUILD.gn into separate file, adds
necessary includes and fixes up GN paths. It also introduces temporary
groups for targets that are used in Chromium so that the paths can be
fixed in a 3-way patch.
Bug: chromium:1064305
Change-Id: Ib4b73bd8d3121ef67d4ecee2e54ec158875f2117
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18861
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
This is to match the WebGPU API change.
The only manual changes are in dawn.json and templates. The rest was
created with the following commands:
git grep -l BindGroupLayoutBinding | xargs sed -i "" -e "s/BindGroupLayoutBinding/BindGroupLayoutEntry/g"
git grep -l BindGroupBinding | xargs sed -i "" -e "s/BindGroupBinding/BindGroupEntry/g"
git cl format
Bug: dawn:22
Change-Id: I1377eef9ea9816578441c91d167909dedc7f8e96
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18863
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
The changes in this CL are copied from Chromium.
Bug: dawn:355
Change-Id: I3772b5849b096dd11541b94331309293f1a64fb5
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18903
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
This reverts commit c7f454c241
and relands commit 2479860e4b.
> D3D12: Stage BindGroups on CPU descriptor heaps.
>
> Instead of directly populating GPU heaps, pre-encoded
> BindGroups are staged on CPU heaps then copied over
> to the GPU. Non-shader visible allocators are stored
> on the BGL, which hands out fixed-size chunks to
> simplify memory managment. To enable memory re-use,
> CPU allocations are tied to the lifetime of BindGroup
> objects.
Reason for revert: We can reland this CL now that the CTS suppression merged.
Note: Adds validation to ensure binding size > 0.
Bug: dawn:155
Bug: dawn:375
Change-Id: I75b9773bbb7c70bcea803a7ad8b6480d21ea90f7
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18904
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
RefCounted (and derived) destructors should be protected on the class
to ensure the objects can ONLY be destructed by calling Release. This
avoids errors cause by destroying objects out from under code which
has an active reference count.
Unfortunately, many of the 'base' classes must continue having public
destructors because they are used as "blueprint" objects created on
the stack.
Added final on most-derived classes.
Ideas for future improvement:
- Change "base" objects to have protected destructors but create new
blueprint objects that privately derive from base objects. This
limits the blueprint object's usefulness to only be a blueprint.
- Modify createX methods to return Ref<Object> instead of Object*
Change-Id: I6f3b3b178118d135c4342cb912e982a3873d71af
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18780
Commit-Queue: Rafael Cintron <rafael.cintron@microsoft.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
The shader with uninitialized variables will fail to compile on D3D12
backend. SPIRV-Cross has added an option for supporting forcefully
zero-initialized variables in latest version.
Bug: dawn:347
Change-Id: Id02fa486317c583ee11cfe3bc382816dc34121fb
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18680
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Roll third_party/SPIRV-Tools/ fd773eb50..e95fbfb1f (9 commits)
fd773eb50d..e95fbfb1f5
$ git log fd773eb50..e95fbfb1f --date=short --no-merges --format='%ad %ae %s'
2020-04-02 afdx spirv-fuzz: Transformation to add OpConstantNull (#3273)
2020-04-02 afdx spirv-fuzz: Handle isomorphic types property in composite construction (#3262)
2020-04-02 afdx spirv-fuzz: Limit adding of new variables to 'basic' types (#3257)
2020-04-02 afdx spirv-fuzz: Only replace regular ids with synonyms (#3255)
2020-04-02 afdx spirv-fuzz: Introduce TransformationContext (#3272)
2020-04-02 afdx spirv-fuzz: Add validator options (#3254)
2020-04-02 alanbaker Update dominates to check for null nodes (#3271)
2020-04-01 alanbaker Set wrapped kill basic block's parent (#3269)
2020-03-31 caio.oliveira Validate Buffer and BufferBlock apply only to struct types (#3259)
Roll third_party/glslang/ 08c02ced7..b5757b950 (5 commits)
08c02ced79..b5757b9500
$ git log 08c02ced7..b5757b950 --date=short --no-merges --format='%ad %ae %s'
2020-04-03 rharrison Remove extra semicolons (#2170)
2020-04-02 mbechard Shader interface matching rework to fix#2136 (#2156)
2020-04-01 cepheus Build warning: Fix#2167: Remove nested reuse of 'unreachable'.
2020-03-31 cepheus Bump revision.
2020-03-30 alele Error assigns to objects of rayQueryEXT type.
Roll third_party/spirv-cross/ 9b3c5e12b..6637610b1 (7 commits)
9b3c5e12be..6637610b16
$ git log 9b3c5e12b..6637610b1 --date=short --no-merges --format='%ad %ae %s'
2020-04-03 post Expose a query if samplers or images are comparison resources.
2020-04-03 post Do not add NonWritable/NonReadable decorations for regular images.
2020-04-03 post MSL: Deal with cases where builtin is implicitly needed, declared, but unused.
2020-04-03 post HLSL: Add support for treating NonWritable UAV texture as SRV instead.
2020-04-03 troughton MSL: mark BuiltInFragCoord as implicitly used for subpass reads
2020-03-31 post MSL: Fix access chain for deep struct hierarchy on array of buffers.
2020-03-30 dsinclair Roll GLSLang, SPIRV-Tools and SPIRV-Headers
Created with:
roll-dep third_party/SPIRV-Tools third_party/glslang third_party/shaderc third_party/spirv-cross third_party/spirv-headers
Change-Id: Ia60a082e6d8b7bc954fedeb444cb5c91bf252f17
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18880
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
This reverts commit 2479860e4b.
Reason for revert: Causes WebGPU CTS failures
Original change's description:
> D3D12: Stage BindGroups on CPU descriptor heaps.
>
> Instead of directly populating GPU heaps, pre-encoded
> BindGroups are staged on CPU heaps then copied over
> to the GPU. Non-shader visible allocators are stored
> on the BGL, which hands out fixed-size chunks to
> simplify memory managment. To enable memory re-use,
> CPU allocations are tied to the lifetime of BindGroup
> objects.
>
> BUG=dawn:155
>
> Change-Id: I402e6686c96f7450a077c627c8499600979e426c
> Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18100
> Commit-Queue: Bryan Bernhart <bryan.bernhart@intel.com>
> Reviewed-by: Corentin Wallez <cwallez@chromium.org>
TBR=cwallez@chromium.org,enga@chromium.org,rafael.cintron@microsoft.com,bryan.bernhart@intel.com
# Not skipping CQ checks because original CL landed > 1 day ago.
Bug: dawn:155
Change-Id: I3dfae3e15e2bc21de692513725c9cf3ca38110b5
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18860
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
f085b9745f..f175adffa9
$ git log f085b9745..f175adffa --date=short --no-merges --format='%ad %ae %s'
2020-04-02 rharrison Add flag to control if we build with -Werror (#1032)
2020-03-31 rharrison Add knob to control force_zero_initialized_variables (#1028)
2020-03-31 dgkoch update glslang to SDK-Candidate-2 tag (#1027)
2020-03-30 rharrison Rolling 5 dependencies and updated exceptions (#1026)
Created with:
roll-dep third_party/shaderc
Bug: dawn:347
Change-Id: Iacd580226c983ad8db71a3b6624ee89ae5c66931
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18781
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
This CL also adds a couple of dummy extensions in dawn.json so that
the serialization/deserialization in the wire can be tested.
Bug: dawn:369
Change-Id: I5ec3853c286f45d9b04e8bf9d04ebd9176dc917b
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18520
Commit-Queue: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Instead of directly populating GPU heaps, pre-encoded
BindGroups are staged on CPU heaps then copied over
to the GPU. Non-shader visible allocators are stored
on the BGL, which hands out fixed-size chunks to
simplify memory managment. To enable memory re-use,
CPU allocations are tied to the lifetime of BindGroup
objects.
BUG=dawn:155
Change-Id: I402e6686c96f7450a077c627c8499600979e426c
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18100
Commit-Queue: Bryan Bernhart <bryan.bernhart@intel.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Dawn was using a very uncommon way to do breaks from case statements
when a block was introduced for that case statement. Fix it by running
the following commands:
git grep -l "} break;" | xargs sed -i "" -e "s/} break;/break;}/"
git cl format
Some -Wunreachable-code-break become very apparent in this CL but and are
fixed in a follow-up to keep mechanical and manual changes separate.
Bug: None
Change-Id: I558eda92bb1c9d938cc7cf07b091b733b57d3aca
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18660
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
The effect to the user is the same, the Dawn device gets lost. However
we need to make the difference internally because when the backend
device is lost we can clean up immediately. On the contrary on internal
errors, the backend device is still alive and processing commands so we
need to gracefully shut it down.
Bug: dawn:269
Change-Id: Ie13b33a4f9ac2e1f5f98b3723d83cf1c6205c988
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/17965
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
And updates all places in tests and examples where they could have been
used.
Bug: dawn:22
Change-Id: Ic36e3f1810037b5addeb9e971b1da28fdd1da183
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18380
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
This patch adds tests to verify that resource usage tracking is per
each pass (neither per each draw/dispatch, nor per each command
encoder or command buffer).
Bug: dawn:358
Change-Id: I7bd05de3539ff2d11bb58cd34a370015907e4666
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18180
Commit-Queue: Yunchao He <yunchao.he@intel.com>
Reviewed-by: Austin Eng <enga@chromium.org>
Fixes compiler error on Linux about bare nullptr_t not existing.
Bug:
Change-Id: I1eb97d40e9ff564775d4ec7bbc54430481475f34
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18320
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Ben Wagner <bungeman@chromium.org>
In PIX's D3D12-only mode, there is no way to determine frame boundaries
for WebGPU since Dawn does not manage DXGI swap chains. Without
assistance, PIX will wait forever for a present that never happens.
If we know we're dealing with a swapbuffer texture, inform PIX we've
"presented" the texture so it can determine frame boundaries and use the
texture's contents for the UI.
Bug: dawn:364
Change-Id: I7eb628c460e1e7c446ad91b29b03dd7b54545afb
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18060
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Rafael Cintron <rafael.cintron@microsoft.com>
We want to release pending commands in Device::WaitForIdleForDestruction()
so that when we call TickImpl(), we can reset the command allocators.
Bug: dawn:269
Change-Id: Ibd8fdd685a4e9ed7cce8176ba097bc67687bcd97
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18101
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
This patch adds resource usage tracking tests for overwritten
situations within a draw/dispatch:
1) multiple SetIndexBuffer
2) multiple SetVertexBuffer on the same index
3) multiple SetBindGroup on the same index
We should track the overwritten resources even though they
are not used in render/compute pass.
Bug: dawn:357
Change-Id: I1e804c9aebfc62acb82513db51b6ae94a85579fb
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18000
Commit-Queue: Yunchao He <yunchao.he@intel.com>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
This moves BindGroupLayoutBase::BindingInfo into the dawn_native
namespace and changes ShaderModule::BindingInfo to extend it with
SPIR-V ids.
Bug: dawn:354
Change-Id: I6a2187e94c0200bee729cf8290f74e4f8c648334
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/17920
Commit-Queue: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Previously the surface extensions were only enabled so we could import
VkSurfaceKHR's created from GLFW. To implement the webgpu.h
surface-based swapchains, we are going to use the extension entrypoints
too.
This changes vulkan_platform.h to set defines that make vulkan.h expose
the entrypoints and datatypes for all the Vulkan extensions we might
care about for a given compilation configuration.
Bug: dawn:269
Change-Id: If4202ff5e31c816eccb5f5381bd36b660a3b6c5b
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/17964
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
MetalFunctionData::function was uninitialized when an error happened
its destructor would run, calling release on a garbage pointer.
Bug:
Change-Id: Ib72038da2a07b4e0f27ec929ec08f303c54dcc62
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/17760
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Previously the code ASSERTed that the semaphores didn't exist on
destroy, but that's not necessarily the case. Handle destruction more
correctly.
Bug: dawn:269
Change-Id: If123e0e20b4ee157c70a1b8cc2f3b20a9473f55e
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/17963
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
All Vulkan implementations on macOS have EXT_metal_surface available
(MoltenVk, Swiftshader and gfx-rs), and it matches webgpu.h's surface
creation from a CAMetalLayer more closely.
Bug: dawn:269
Change-Id: I313cd366b3509fb8930552406d150f08fc8e3666
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/17962
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
VulkanFunctions handles the storing of Vulkan function pointers so Dawn
doesn't need the declarations for Vulkan entrypoints.
Bug: dawn:269
Change-Id: I25f05d4a82fd31a60b22257261e940ce276f5eac
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/17960
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
This change mainly does a code refactoring. It moves resource tracking
tests from CommandBufferValidationTests.cpp to a separate test file.
It also adds a few tests, like copy dst/src doesn't impact resources
used in render/compute pass.
More tests about resource usage tracking will be added into this
separate test file.
Bug: dawn:359
Change-Id: I29d9b87b8de9a07b39ee1087e9f6a53ad10fe8fe
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/17720
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Yunchao He <yunchao.he@intel.com>
CL#14740 modified the result format but
the test runner script was never updated.
This fixes the result format and metric check.
Bug: dawn:208
Change-Id: I3a128b91e20ff8629b091ef4bf8fdd6fb616ba0e
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/17921
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Bryan Bernhart <bryan.bernhart@intel.com>
This makes accessing per-index data simpler, and now that dynamic
buffer bindings are packed at the front, the old IterateBitset on
the dynamic buffer binding mask can be replaced with a simple loop
over the beginning bindings.
Bug: dawn:354
Change-Id: I1adf371c3228690758f90ab1f0de88ad8d0f950d
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/17681
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
This patch records if a storage texture is declared as multisampled or
not in shaders after a fix in shaderc.
BUG=dawn:267
TEST=dawn_unittests
Change-Id: I3914ccd3bfa4d0b6ab9c7cfb650352b70ba067a5
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/17600
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Adds a toggle to force the use of small shader-visible heaps and
whitebox tests to verify bindgroup encoding correctness.
BUG=dawn:155
Change-Id: I4118b850d9f2cb445ae805aa68ebf4fab671261b
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16960
Commit-Queue: Bryan Bernhart <bryan.bernhart@intel.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
This patch adds all the validations on the creation of bind groups with
read-only and write-only storage textures.
1. Only the textures with STORAGE usage can be used as read-only or
write-only storage textures.
2. The format of the texture view used as read-only or write-only
storage texture must match the corresponding declarations in the
bind group layout.
3. The texture view dimension of the texture view used as read-only or
write-only storage texture must match the corresponding declaration
in the bind group layout.
Note that we don't test the match of the sample count because currently
we don't support sample count > 1 when creating a texture with STORAGE
usage and creating a bind group layout with read-only or write-only
storage textrue binding type.
This patch also adds a unit test to verify that it is invalid to create
a bind group layout with either read-only or write-only storage texture
binding type and dynamic offsets.
This patch also implements the bind group with storage textures on
Vulkan to make the Vulkan fuzzer happy with this patch.
BUG=dawn:267
TEST=dawn_unittests
Change-Id: Iee1b3c49671aae8a5424882b035624248d5fc281
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/17583
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
ErrorData should not be discarded. The error must be handled.
Bug: chromium:1063810
Change-Id: I55e782e499f307b91790db10a42878afdc7540dd
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/17501
Commit-Queue: Austin Eng <enga@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
This is a regression that was caught by the WebGPU CTS after
https://dawn-review.googlesource.com/c/dawn/+/17240 where the
BindGroupLayout validation was changed to use a set, and the check for
KMaxBindingsPerGroup removed.
This CL also adds a regression test.
Bug: dawn:354
Change-Id: I0cda545b9df7220ca53216878cf24ac8ce880648
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/17620
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>