Use newImageSnapshot() to get an image from a Canvas

Source/platform/graphics/ImageBuffer.cpp

 /*
  * Copyright (c) 2008, Google Inc. All rights reserved.
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
@@ skipping 112 matching lines @@
     if (m_client)
         m_client->notifySurfaceInvalid();
 }
 
 void ImageBuffer::didPresent()
 {
     if (m_client)
         m_client->didPresent();
 }
 
+PassRefPtr<SkImage> ImageBuffer::newImageSnapshot() const
+{
+    return m_surface->newImageSnapshot();
+}
+
 static SkBitmap deepSkBitmapCopy(const SkBitmap& bitmap)
 {
     SkBitmap tmp;
     if (!bitmap.deepCopyTo(&tmp))
         bitmap.copyTo(&tmp, bitmap.colorType());
 
     return tmp;
 }
 
 PassRefPtr<Image> ImageBuffer::copyImage(BackingStoreCopy copyBehavior, ScaleBehavior) const
@@ skipping 279 matching lines @@
     if (!encodeImage(imageData, mimeType, quality, &encodedImage))
         return "data:,";
 
     Vector<char> base64Data;
     base64Encode(encodedImage, base64Data);
 
     return "data:" + mimeType + ";base64," + base64Data;
 }
 
 } // namespace blink