The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/23b4e88d6090ae9f2b2fa9aa062152900c09f7e9

commit 23b4e88d6090ae9f2b2fa9aa062152900c09f7e9
Author: xidachen <xidachen@chromium.org>
Date: Tue Aug 02 18:04:15 2016

Add a new class AcceleratedStaticBitmap : StaticBitmapImage

At this moment, the StaticBitmapImage holds RefPtr to a SkImage, or a
WebExternalTextureMailbox. So there are in total of three cases:
1). The SkImage is not texture backed.
2). The SkImage is GPU texture backed.
3). The SkImage is null, but has a valid mailbox.

It makes more sense to break this class into two classes. So this CL
adds a new class called AcceleratedStaticBitmap, inherited from the
StaticBitmapImage class, is in charge of case 2 and 3. Case 1 is handled
by the StaticBitmapImage class.

We can use the bots (including the GPU_Optional bots) to make sure this
change doesn't break anything.

BUG= 632722 

Review-Url: https://codereview.chromium.org/2196963002
Cr-Commit-Position: refs/heads/master@{#409238}

[modify] https://crrev.com/23b4e88d6090ae9f2b2fa9aa062152900c09f7e9/third_party/WebKit/Source/core/frame/ImageBitmap.cpp
[modify] https://crrev.com/23b4e88d6090ae9f2b2fa9aa062152900c09f7e9/third_party/WebKit/Source/platform/blink_platform.gypi
[add] https://crrev.com/23b4e88d6090ae9f2b2fa9aa062152900c09f7e9/third_party/WebKit/Source/platform/graphics/AcceleratedStaticBitmapImage.cpp
[add] https://crrev.com/23b4e88d6090ae9f2b2fa9aa062152900c09f7e9/third_party/WebKit/Source/platform/graphics/AcceleratedStaticBitmapImage.h
[modify] https://crrev.com/23b4e88d6090ae9f2b2fa9aa062152900c09f7e9/third_party/WebKit/Source/platform/graphics/StaticBitmapImage.cpp
[modify] https://crrev.com/23b4e88d6090ae9f2b2fa9aa062152900c09f7e9/third_party/WebKit/Source/platform/graphics/StaticBitmapImage.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/645b3cc4697033ab68738dc68d9dfd8db200c008

commit 645b3cc4697033ab68738dc68d9dfd8db200c008
Author: junov <junov@chromium.org>
Date: Fri Aug 19 13:58:10 2016

Stop using GrTexture::get/setCustomData in Canvas2DLayerBridge

Canvas2DLayerBridge was using custom data to cache mailbox names
associated with recycled textures managed by skia.  This helped
prevent leaking mailboxes.  This CL uses a different approach
that consists in disassociating mailboxes to prevent the mailbox
leak.  The goal is to allow the skia team to proceed with the
deprecation of texture custom data attachments.

BUG= 632722 

Review-Url: https://codereview.chromium.org/2262533002
Cr-Commit-Position: refs/heads/master@{#413129}

[modify] https://crrev.com/645b3cc4697033ab68738dc68d9dfd8db200c008/third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.cpp

bsalomon: Now that this is done, feel free to go ahead and remove custom data from GrTexture!

Thanks!!