The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d03c005d730e9510dd6afa7f8d8199e370db96f5

commit d03c005d730e9510dd6afa7f8d8199e370db96f5
Author: ericrk <ericrk@chromium.org>
Date: Fri Mar 24 18:48:52 2017

Enable RGBA_4444 in GpuRasterBufferProvider

Currently, OneCopy/ZeroCopyRasterBufferProvider supports RGBA_4444
(used in Svelte). This change adds similar logic to
GpuRasterBufferProvider.

This also splits ResourceProvider::IsResourceFormatSupported into
ResourceProvider::IsTextureFormatSupported and
IsRasterBufferFormatSupported. This naming matches the existing
best_texture_format() and best_raster_buffer_format() names.

BUG= 704680 
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2775723002
Cr-Commit-Position: refs/heads/master@{#459494}

[modify] https://crrev.com/d03c005d730e9510dd6afa7f8d8199e370db96f5/cc/output/gl_renderer.cc
[modify] https://crrev.com/d03c005d730e9510dd6afa7f8d8199e370db96f5/cc/raster/gpu_raster_buffer_provider.cc
[modify] https://crrev.com/d03c005d730e9510dd6afa7f8d8199e370db96f5/cc/raster/gpu_raster_buffer_provider.h
[modify] https://crrev.com/d03c005d730e9510dd6afa7f8d8199e370db96f5/cc/raster/one_copy_raster_buffer_provider.cc
[modify] https://crrev.com/d03c005d730e9510dd6afa7f8d8199e370db96f5/cc/raster/raster_buffer_provider_perftest.cc
[modify] https://crrev.com/d03c005d730e9510dd6afa7f8d8199e370db96f5/cc/raster/raster_buffer_provider_unittest.cc
[modify] https://crrev.com/d03c005d730e9510dd6afa7f8d8199e370db96f5/cc/raster/zero_copy_raster_buffer_provider.cc
[modify] https://crrev.com/d03c005d730e9510dd6afa7f8d8199e370db96f5/cc/resources/resource_provider.cc
[modify] https://crrev.com/d03c005d730e9510dd6afa7f8d8199e370db96f5/cc/resources/resource_provider.h
[modify] https://crrev.com/d03c005d730e9510dd6afa7f8d8199e370db96f5/cc/test/layer_tree_pixel_resource_test.cc
[modify] https://crrev.com/d03c005d730e9510dd6afa7f8d8199e370db96f5/cc/trees/layer_tree_host_impl.cc