cc: Add image decode control in the compositor.

cc/playback/display_list_raster_source.h

Index: cc/playback/display_list_raster_source.h
diff --git a/cc/playback/display_list_raster_source.h b/cc/playback/display_list_raster_source.h
index 8c06c8d68637dc5175b18bf8d93ee57ace1a8bc9..c1e83a3ee7d706346effe124bdc9c8c804325352 100644
--- a/cc/playback/display_list_raster_source.h
+++ b/cc/playback/display_list_raster_source.h
@@ -18,6 +18,7 @@
 namespace cc {
 class DisplayItemList;
 class DrawImage;
+class ImageDecodeController;
 
 class CC_EXPORT DisplayListRasterSource
     : public base::RefCountedThreadSafe<DisplayListRasterSource> {
@@ -106,6 +107,10 @@ class CC_EXPORT DisplayListRasterSource
 
   scoped_refptr<DisplayListRasterSource> CreateCloneWithoutLCDText() const;
 
+  // Image decode controller should be set once. Its lifetime has to exceed that
+  // of the raster source, since the raster source will access it during raster.
+  void SetImageDecodeController(ImageDecodeController* image_decode_controller);
+
  protected:
   friend class base::RefCountedThreadSafe<DisplayListRasterSource>;
 
@@ -132,6 +137,10 @@ class CC_EXPORT DisplayListRasterSource
   // threads with multi-threaded Ganesh.  Make this const or remove it.
   bool should_attempt_to_use_distance_field_text_;
 
+  // In practice, this is only set once before raster begins, so it's ok with
+  // respect to threading.
+  ImageDecodeController* image_decode_controller_;
+
  private:
   // Called when analyzing a tile. We can use AnalysisCanvas as
   // SkPicture::AbortCallback, which allows us to early out from analysis.