cc: Make image controller return a status with the callback.

cc/tiles/checker_image_tracker.h

Index: cc/tiles/checker_image_tracker.h
diff --git a/cc/tiles/checker_image_tracker.h b/cc/tiles/checker_image_tracker.h
index af0bc0e86f37b8927d342fb19dfdb0f04388a047..b2a16ecf9b2d60c9e4b9cc1371c47329c9fd406e 100644
--- a/cc/tiles/checker_image_tracker.h
+++ b/cc/tiles/checker_image_tracker.h
@@ -55,7 +55,8 @@ class CC_EXPORT CheckerImageTracker {
 
  private:
   void DidFinishImageDecode(ImageId image_id,
-                            ImageController::ImageDecodeRequestId request_id);
+                            ImageController::ImageDecodeRequestId request_id,
+                            ImageController::ImageDecodeResult result);
 
   // Returns true if the decode for |image| will be deferred to the image decode
   // service and it should be be skipped during raster.