The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9afecdff864427ce00a8da161880b53d8e0a54f9

commit 9afecdff864427ce00a8da161880b53d8e0a54f9
Author: Reza.Zakerinasab <zakerinasab@chromium.org>
Date: Tue Sep 25 11:26:26 2018

Support half float backed images in ImageDecodeCache

This change adds half float backed image support to GPU and Software
ImageDecodeCache. This is a partial CL toward supporting 16 bit PNGs
in the new color management canvas API
(chromium-review.googlesource.com/c/chromium/src/+/1079788).

BUG:  874943 
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_layout_tests_slimming_paint_v2;luci.chromium.try:win_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I51b22b4eb459f126d93b98501e168403e87be44f
Reviewed-on: https://chromium-review.googlesource.com/1156876
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Reviewed-by: Fernando Serboncini <fserb@chromium.org>
Commit-Queue: Mohammad Reza Zakerinasab <zakerinasab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593890}
[modify] https://crrev.com/9afecdff864427ce00a8da161880b53d8e0a54f9/cc/BUILD.gn
[modify] https://crrev.com/9afecdff864427ce00a8da161880b53d8e0a54f9/cc/paint/paint_image.cc
[modify] https://crrev.com/9afecdff864427ce00a8da161880b53d8e0a54f9/cc/paint/paint_image.h
[modify] https://crrev.com/9afecdff864427ce00a8da161880b53d8e0a54f9/cc/test/skia_common.cc
[modify] https://crrev.com/9afecdff864427ce00a8da161880b53d8e0a54f9/cc/test/skia_common.h
[modify] https://crrev.com/9afecdff864427ce00a8da161880b53d8e0a54f9/cc/tiles/gpu_image_decode_cache.cc
[modify] https://crrev.com/9afecdff864427ce00a8da161880b53d8e0a54f9/cc/tiles/gpu_image_decode_cache_unittest.cc
[modify] https://crrev.com/9afecdff864427ce00a8da161880b53d8e0a54f9/cc/tiles/image_decode_cache.h
[add] https://crrev.com/9afecdff864427ce00a8da161880b53d8e0a54f9/cc/tiles/image_decode_cache_utils.cc
[add] https://crrev.com/9afecdff864427ce00a8da161880b53d8e0a54f9/cc/tiles/image_decode_cache_utils.h
[modify] https://crrev.com/9afecdff864427ce00a8da161880b53d8e0a54f9/cc/tiles/software_image_decode_cache_unittest_combinations.cc
[modify] https://crrev.com/9afecdff864427ce00a8da161880b53d8e0a54f9/cc/tiles/software_image_decode_cache_utils.cc
[modify] https://crrev.com/9afecdff864427ce00a8da161880b53d8e0a54f9/cc/tiles/software_image_decode_cache_utils.h
[modify] https://crrev.com/9afecdff864427ce00a8da161880b53d8e0a54f9/content/renderer/webgraphicscontext3d_provider_impl.cc
[modify] https://crrev.com/9afecdff864427ce00a8da161880b53d8e0a54f9/content/renderer/webgraphicscontext3d_provider_impl.h
[modify] https://crrev.com/9afecdff864427ce00a8da161880b53d8e0a54f9/third_party/blink/public/platform/web_graphics_context_3d_provider.h
[modify] https://crrev.com/9afecdff864427ce00a8da161880b53d8e0a54f9/third_party/blink/renderer/platform/graphics/canvas_resource_provider.cc
[modify] https://crrev.com/9afecdff864427ce00a8da161880b53d8e0a54f9/third_party/blink/renderer/platform/graphics/gpu/drawing_buffer_test_helpers.h
[modify] https://crrev.com/9afecdff864427ce00a8da161880b53d8e0a54f9/third_party/blink/renderer/platform/graphics/image.cc
[modify] https://crrev.com/9afecdff864427ce00a8da161880b53d8e0a54f9/third_party/blink/renderer/platform/graphics/image.h
[modify] https://crrev.com/9afecdff864427ce00a8da161880b53d8e0a54f9/third_party/blink/renderer/platform/graphics/test/fake_web_graphics_context_3d_provider.h