Teach Skia to use discardable memory

Source/core/platform/graphics/ImageFrameGenerator.h

Index: Source/core/platform/graphics/ImageFrameGenerator.h
diff --git a/Source/core/platform/graphics/ImageFrameGenerator.h b/Source/core/platform/graphics/ImageFrameGenerator.h
index 627229de8a58afeac626baa0b8dc744ecee1dbd6..931fa986f39238312ec3408f335e1556985e46c2 100644
--- a/Source/core/platform/graphics/ImageFrameGenerator.h
+++ b/Source/core/platform/graphics/ImageFrameGenerator.h
@@ -62,6 +62,13 @@ public:
 
     const ScaledImageFragment* decodeAndScale(const SkISize& scaledSize, size_t index = 0);
 
+    // Decodes and scales the specified frame indicated by |index|. Dimensions
+    // and output format are specified in |info|. Decoded pixels are written
+    // into |pixels| with a stride of |rowBytes|.
+    //
+    // Returns true if decoding was successful.
+    bool decodeAndScale(const SkImageInfo&, size_t index, void* pixels, size_t rowBytes);
+
     void setData(PassRefPtr<SharedBuffer>, bool allDataReceived);
 
     // Creates a new SharedBuffer containing the data received so far.