JPEGImageDecoder RGB565 and downsample support and related Skia imagegenerator changes

third_party/WebKit/Source/platform/image-decoders/ImageDecoder.cpp

 /*
  * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Library General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 243 matching lines @@
     ASSERT((i >= 0) && i < 3);
     return m_planes[i];
 }
 
 size_t ImagePlanes::rowBytes(int i) const
 {
     ASSERT((i >= 0) && i < 3);
     return m_rowBytes[i];
 }
 
+void ImageDecoder::defaultDecodeAndScale(ImageFrame::ColorType* outType, float* scale, float* lowerScale)
+{
+    if (outType)
+        *outType = ImageFrame::RGBA8888;
+    if (scale)
+        *scale = 1.0f;
+    if (lowerScale)
+        *lowerScale = 0;
+}
+
 } // namespace blink