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 ac4a80ae0cc7e3398a9b16a03255398d42640394..73c7a7f50ac6c37b7bbba5a2ced37c99d53a6e66 100644
--- a/cc/playback/display_list_raster_source.h
+++ b/cc/playback/display_list_raster_source.h
@@ -21,6 +21,7 @@
 namespace cc {
 class DisplayItemList;
 class DrawImage;
+class ImageDecodeController;
 
 class CC_EXPORT DisplayListRasterSource
     : public base::RefCountedThreadSafe<DisplayListRasterSource> {
@@ -102,6 +103,10 @@ 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>;
 
@@ -128,6 +133,10 @@ 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.