Make DrawingBuffer and Canvas2DLayerBridge be cc::TextureLayerClients.

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 628 matching lines @@
 
 void WebGLRenderingContextBase::forceNextWebGLContextCreationToFail()
 {
     shouldFailContextCreationForTesting = true;
 }
 
 ImageBitmap* WebGLRenderingContextBase::transferToImageBitmapBase()
 {
     if (!drawingBuffer())
         return nullptr;
-    WebExternalTextureMailbox mailbox;
-    drawingBuffer()->prepareMailbox(&mailbox, 0);
-    ImageBitmap* imageBitmap;
-    // If the mailbox is invalid, return an transparent black ImageBitmap.
-    // The only situation this could happen is when two or more calls to transferToImageBitmap are made back-to-back.
-    if (mailbox.textureSize.width == 0 && mailbox.textureSize.height == 0) {
-        sk_sp<SkSurface>surface = SkSurface::MakeRasterN32Premul(drawingBuffer()->size().width(), drawingBuffer()->size().height());
-        imageBitmap = ImageBitmap::create(StaticBitmapImage::create(fromSkSp(surface->makeImageSnapshot())));
-    } else {
-        imageBitmap = ImageBitmap::create(mailbox);
-    }
-    // TODO(xidachen): Create a small pool of recycled textures from ImageBitmapRenderingContext's
-    // transferFromImageBitmap, and try to use them in DrawingBuffer.
-    return imageBitmap;
+    return ImageBitmap::create(drawingBuffer()->transferToStaticBitmapImage());
 }
 
 namespace {
 
 // ES2 enums
 static const GLenum kSupportedInternalFormatsES2[] = {
     GL_RGB,
     GL_RGBA,
     GL_LUMINANCE_ALPHA,
     GL_LUMINANCE,
@@ skipping 5831 matching lines @@
 
 void WebGLRenderingContextBase::getHTMLOrOffscreenCanvas(HTMLCanvasElementOrOffscreenCanvas& result) const
 {
     if (canvas())
         result.setHTMLCanvasElement(canvas());
     else
         result.setOffscreenCanvas(getOffscreenCanvas());
 }
 
 } // namespace blink