Notify listeners on OffScreenCanvas changes

third_party/WebKit/Source/platform/graphics/AcceleratedStaticBitmapImage.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/graphics/AcceleratedStaticBitmapImage.h"
 
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "gpu/command_buffer/common/sync_token.h"
 #include "platform/graphics/MailboxTextureHolder.h"
 #include "platform/graphics/SkiaTextureHolder.h"
@@ skipping 73 matching lines @@
       GL_TEXTURE_2D, m_textureHolder->mailbox().name);
   destGL->CopyTextureCHROMIUM(sourceTextureId, 0, GL_TEXTURE_2D, destTextureId,
                               0, internalFormat, destType, flipY, false, false);
   // This drops the |destGL| context's reference on our |m_mailbox|, but it's
   // still held alive by our SkImage.
   destGL->DeleteTextures(1, &sourceTextureId);
 }
 
 sk_sp<SkImage> AcceleratedStaticBitmapImage::imageForCurrentFrame(
     const ColorBehavior& colorBehavior) {
+  // TODO(xlai): Refactor so that sync tokens are only used when
+  // |m_textureHolder| is MailboxTextureHolder.
+  // https://crbug.com/693229
   // TODO(ccameron): This function should not ignore |colorBehavior|.
   // https://crbug.com/672306
   checkThread();
   if (!isValid())
     return nullptr;
   createImageFromMailboxIfNeeded();
   return m_textureHolder->skImage();
 }
 
 void AcceleratedStaticBitmapImage::draw(PaintCanvas* canvas,
@@ skipping 69 matching lines @@
 
 void AcceleratedStaticBitmapImage::checkThread() {
   if (m_detachThreadAtNextCheck) {
     m_threadChecker.DetachFromThread();
     m_detachThreadAtNextCheck = false;
   }
   CHECK(m_threadChecker.CalledOnValidThread());
 }
 
 }  // namespace blink