cc: Remove ScheduleOnOriginThread() and CompleteOnOriginThread().

cc/tiles/image_decode_controller.h

Index: cc/tiles/image_decode_controller.h
diff --git a/cc/tiles/image_decode_controller.h b/cc/tiles/image_decode_controller.h
index 4bf03d86bd8d41a84d4265c348c46c1497b59f0b..b3d65af94c8ce6da3b8188cc0db9d729721cb0ad 100644
--- a/cc/tiles/image_decode_controller.h
+++ b/cc/tiles/image_decode_controller.h
@@ -12,6 +12,7 @@
 namespace cc {
 
 class ImageDecodeTask;
+class Task;
 
 // ImageDecodeController is responsible for generating decode tasks, decoding
 // images, storing images in cache, and being able to return the decoded images
@@ -59,6 +60,8 @@ class CC_EXPORT ImageDecodeController {
   virtual void DrawWithImageFinished(const DrawImage& image,
                                      const DecodedDrawImage& decoded_image) = 0;
 
+  virtual void CompleteTask(Task* task) = 0;
+
   // This function informs the controller that now is a good time to clean up
   // memory. This is called periodically from the compositor thread.
   virtual void ReduceCacheUsage() = 0;