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Corentin Wallez 3a1746e71c Introduce wgpu::Surface and implement it for HWND, X11 and Metal 
This is another step to implement webgpu.h swapchains, Surface is
essentially a union type of all the types of windows that can be used to
create swapchains.

Changes to allow implementing wgpu::Surface and test its creation are:

 - Add GLFWUtils.cpp/.h/_metal.mm  that contains helpers used to use
WebGPU with GLFW. This deprecates BackendBinding.h that will be removed
when the NXT swapchain is removed.
 - Add a `dawn_use_x11` GN variable to factor all the places in BUILD.gn
where we checked whether we should use X11.
 - Add a `supports_glfw_for_windowing` GN variable in the main BUILD.gn
file to control which configuration tests and samples using GLFW can be
built.
 - Add a ObjCUtils.h to contain some ObjC functionality that we'd need
in files that otherwise would be C++ (so that they can be compiled on
all platforms).

Bug: dawn:269

Change-Id: I25548142a1d1d1f05b0f4d71aa3bdc4698d19622
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/15081
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
 		2020-01-15 13:14:12 +00:00
..
templates Introduce wgpu::Surface and implement it for HWND, X11 and Metal 2020-01-15 13:14:12 +00:00
BUILD.gn BUILD.gn: Delete stale generated files in Dawn's gen dir. 2019-09-19 23:30:42 +00:00
dawn_generator.gni BUILD.gn: Delete stale generated files in Dawn's gen dir. 2019-09-19 23:30:42 +00:00
dawn_json_generator.py webgpu.h introduce a base struct for extension structures. 2020-01-15 09:54:42 +00:00
extract_json.py BUILD.gn: Remove use of exec_script 2018-08-20 07:24:55 -04:00
generator_lib.gni BUILD.gn: Delete stale generated files in Dawn's gen dir. 2019-09-19 23:30:42 +00:00
generator_lib.py BUILD.gn: Add a check generated files are in allowed dirs. 2019-09-18 23:19:31 +00:00
opengl_loader_generator.py Normalize generated file paths to match main tree. 2019-09-18 04:33:12 +00:00
remove_files.py BUILD.gn: Delete stale generated files in Dawn's gen dir. 2019-09-19 23:30:42 +00:00