Bug 1223436 - Fix AsyncCompositionManager so that mLayersUpdated is only set to false after SyncFrameMetrics has been called. r=kats

--HG--
extra : commitid : 14Ip4CDsoEZ

gfx/layers/composite/AsyncCompositionManager.cpp

@@ -818,9 +818,9 @@ AsyncCompositionManager::ApplyAsyncContentTransformToTree(Layer *aLayer,
               geckoZoom * asyncTransformWithoutOverscroll.mScale,
               metrics.GetScrollableRect(), displayPort, geckoZoom, mLayersUpdated,
               mPaintSyncId, fixedLayerMargins);
+          mLayersUpdated = false;
         }
         mIsFirstPaint = false;
-        mLayersUpdated = false;
         mPaintSyncId = 0;
       }
     }