Bug 993019 - [Camera] [Gallery] Orientation response is slow after launching from Camera app. r=kats

gfx/layers/composite/AsyncCompositionManager.cpp

@@ -101,6 +101,8 @@ AsyncCompositionManager::ResolveRefLayers()
   if (!mLayerManager->GetRoot()) {
     return;
   }
+
+  mReadyForCompose = true;
   WalkTheTree<Resolve>(mLayerManager->GetRoot(),
                        mReadyForCompose,
                        mTargetConfig);