Use newImageSnapshot() to get an image from a Canvas

Source/platform/graphics/ImageBufferSurface.cpp

 /*
  * Copyright (c) 2013, Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 
 #include "platform/graphics/ImageBufferSurface.h"
 
 #include "platform/graphics/ImageBuffer.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkDevice.h"
+#include "third_party/skia/include/core/SkImage.h"
 #include "third_party/skia/include/core/SkPicture.h"
 
 namespace blink {
 
 ImageBufferSurface::ImageBufferSurface(const IntSize& size, OpacityMode opacityMode)
     : m_opacityMode(opacityMode)
     , m_size(size)
 {
     setIsHidden(false);
 }
 
+ImageBufferSurface::~ImageBufferSurface() { }
+
 PassRefPtr<SkPicture> ImageBufferSurface::getPicture()
 {
     return nullptr;
 }
 
 void ImageBufferSurface::clear()
 {
     // Clear the background transparent or opaque, as required. It would be nice if this wasn't
     // required, but the canvas is currently filled with the magic transparency
     // color. Can we have another way to manage this?
@@ skipping 12 matching lines @@
     willAccessPixels();
     return canvas()->getTopDevice()->accessBitmap(false);
 }
 
 const SkBitmap& ImageBufferSurface::cachedBitmap() const
 {
     DEFINE_STATIC_LOCAL(SkBitmap, nullBitmap, ());
     return nullBitmap;
 }
 
+PassRefPtr<SkImage> ImageBufferSurface::newImageSnapshot() const
+{
+    return nullptr;
+}
+
 } // namespace blink