The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f913f8dd9fd03078f4c0786c91837dfab07698c7

commit f913f8dd9fd03078f4c0786c91837dfab07698c7
Author: Justin Novosad <junov@chromium.org>
Date: Thu Nov 30 17:31:53 2017

Make CanvasResource RefCounted

This is a step towards unifying OffscreenCanvasResourceProvider
with CanvasResourceProvider, which will eventually allow low
latency canvas rendering to use a single buffered GpuMemoryBuffer

BUG=788439,  776801 

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: Ie9f04e7920e7d74c229c4d45c34c371ab5d06e36
Reviewed-on: https://chromium-review.googlesource.com/800670
Commit-Queue: Justin Novosad <junov@chromium.org>
Reviewed-by: Olivia Lai <xlai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520586}
[modify] https://crrev.com/f913f8dd9fd03078f4c0786c91837dfab07698c7/third_party/WebKit/Source/platform/graphics/CanvasResource.cpp
[modify] https://crrev.com/f913f8dd9fd03078f4c0786c91837dfab07698c7/third_party/WebKit/Source/platform/graphics/CanvasResource.h
[modify] https://crrev.com/f913f8dd9fd03078f4c0786c91837dfab07698c7/third_party/WebKit/Source/platform/graphics/CanvasResourceProvider.cpp
[modify] https://crrev.com/f913f8dd9fd03078f4c0786c91837dfab07698c7/third_party/WebKit/Source/platform/graphics/CanvasResourceProvider.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4f6bce25c2f94e59611343ddab1fffcc13f79f07

commit 4f6bce25c2f94e59611343ddab1fffcc13f79f07
Author: Justin Novosad <junov@chromium.org>
Date: Tue Dec 05 22:44:49 2017

Move TransferableResource creation to Canvas Resource

This change makes it possible to decouple the actions of capturing an
animation frame from a canvas and sending it to the compositor.
This is a prerequisite for mergin OffscreenCanvasResourceProdiver
with CanvasResourceProvider.

Bug: 788439,  776801 
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: Iaf4563069ede53b1bba8bde5ea8b693d4c1a2b73
Reviewed-on: https://chromium-review.googlesource.com/803945
Commit-Queue: Justin Novosad <junov@chromium.org>
Reviewed-by: Olivia Lai <xlai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521868}
[modify] https://crrev.com/4f6bce25c2f94e59611343ddab1fffcc13f79f07/third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.cpp
[modify] https://crrev.com/4f6bce25c2f94e59611343ddab1fffcc13f79f07/third_party/WebKit/Source/platform/graphics/CanvasResource.cpp
[modify] https://crrev.com/4f6bce25c2f94e59611343ddab1fffcc13f79f07/third_party/WebKit/Source/platform/graphics/CanvasResource.h
[modify] https://crrev.com/4f6bce25c2f94e59611343ddab1fffcc13f79f07/third_party/WebKit/Source/platform/graphics/CanvasResourceProvider.cpp
[modify] https://crrev.com/4f6bce25c2f94e59611343ddab1fffcc13f79f07/third_party/WebKit/Source/platform/graphics/CanvasResourceProvider.h
[modify] https://crrev.com/4f6bce25c2f94e59611343ddab1fffcc13f79f07/third_party/WebKit/Source/platform/graphics/CanvasResourceTest.cpp

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2e4a432454ac3f04d6c5fa8f17c49ce3026217d6

commit 2e4a432454ac3f04d6c5fa8f17c49ce3026217d6
Author: Justin Novosad <junov@chromium.org>
Date: Thu Dec 14 22:37:30 2017

Replace CanvasResource_Skia with CanvasResource_Bitmap

This change refactors the existing CanvasResource_Skia to make it
store a StaticBitmapImage instead of an SkImage intenally. This
simplifies the gpu mailbox management code by re-using the
functionality provided by StaticBitmapImage. It also bring the code
closer to unifying OffscreenCanvasResourceProvider with
CanvasResourceProvider

BUG=788439, 776801 
TBR=bajones@chromium.org

Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: Ia57a68e1a61763daa158403e258b89b56a82a6f7
Reviewed-on: https://chromium-review.googlesource.com/820251
Commit-Queue: Justin Novosad <junov@chromium.org>
Reviewed-by: Olivia Lai <xlai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524204}
[modify] https://crrev.com/2e4a432454ac3f04d6c5fa8f17c49ce3026217d6/third_party/WebKit/Source/modules/vr/VRDisplay.cpp
[modify] https://crrev.com/2e4a432454ac3f04d6c5fa8f17c49ce3026217d6/third_party/WebKit/Source/platform/graphics/AcceleratedStaticBitmapImage.cpp
[modify] https://crrev.com/2e4a432454ac3f04d6c5fa8f17c49ce3026217d6/third_party/WebKit/Source/platform/graphics/AcceleratedStaticBitmapImage.h
[modify] https://crrev.com/2e4a432454ac3f04d6c5fa8f17c49ce3026217d6/third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.cpp
[modify] https://crrev.com/2e4a432454ac3f04d6c5fa8f17c49ce3026217d6/third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridgeTest.cpp
[modify] https://crrev.com/2e4a432454ac3f04d6c5fa8f17c49ce3026217d6/third_party/WebKit/Source/platform/graphics/CanvasResource.cpp
[modify] https://crrev.com/2e4a432454ac3f04d6c5fa8f17c49ce3026217d6/third_party/WebKit/Source/platform/graphics/CanvasResource.h
[modify] https://crrev.com/2e4a432454ac3f04d6c5fa8f17c49ce3026217d6/third_party/WebKit/Source/platform/graphics/CanvasResourceProvider.cpp
[modify] https://crrev.com/2e4a432454ac3f04d6c5fa8f17c49ce3026217d6/third_party/WebKit/Source/platform/graphics/CanvasResourceTest.cpp
[modify] https://crrev.com/2e4a432454ac3f04d6c5fa8f17c49ce3026217d6/third_party/WebKit/Source/platform/graphics/GpuMemoryBufferImageCopy.cpp
[modify] https://crrev.com/2e4a432454ac3f04d6c5fa8f17c49ce3026217d6/third_party/WebKit/Source/platform/graphics/MailboxTextureHolder.cpp
[modify] https://crrev.com/2e4a432454ac3f04d6c5fa8f17c49ce3026217d6/third_party/WebKit/Source/platform/graphics/MailboxTextureHolder.h
[modify] https://crrev.com/2e4a432454ac3f04d6c5fa8f17c49ce3026217d6/third_party/WebKit/Source/platform/graphics/OffscreenCanvasResourceProvider.cpp
[modify] https://crrev.com/2e4a432454ac3f04d6c5fa8f17c49ce3026217d6/third_party/WebKit/Source/platform/graphics/StaticBitmapImage.cpp
[modify] https://crrev.com/2e4a432454ac3f04d6c5fa8f17c49ce3026217d6/third_party/WebKit/Source/platform/graphics/StaticBitmapImage.h
[modify] https://crrev.com/2e4a432454ac3f04d6c5fa8f17c49ce3026217d6/third_party/WebKit/Source/platform/graphics/TextureHolder.h
[modify] https://crrev.com/2e4a432454ac3f04d6c5fa8f17c49ce3026217d6/third_party/WebKit/Source/platform/graphics/gpu/GraphicsContext3DUtils.cpp
[modify] https://crrev.com/2e4a432454ac3f04d6c5fa8f17c49ce3026217d6/third_party/WebKit/Source/platform/graphics/gpu/GraphicsContext3DUtils.h
[modify] https://crrev.com/2e4a432454ac3f04d6c5fa8f17c49ce3026217d6/third_party/WebKit/Source/platform/graphics/gpu/ImageLayerBridge.cpp
[modify] https://crrev.com/2e4a432454ac3f04d6c5fa8f17c49ce3026217d6/third_party/WebKit/Source/platform/graphics/gpu/SharedGpuContextTest.cpp

This is almost done.  There is still a little bit of resource management logic left in OffscreenCanvasResourceProvider, which could easily be folded into CanvasResourceDispatcher.

It seems that this bug is fixed now since apparently offscreen frame dispatcher is using CanvasResourceProvider and CanvasResourceDispatcher. The documentation needs to get updated though:
https://cs.chromium.org/chromium/src/third_party/blink/renderer/modules/canvas/offscreencanvas/OffscreenCanvas-commit.md?l=237

Re: #19 That documentation most likely needs to be redone completely.