Allow painted layers with ancestor mask layers to use OMTP (bug 1419586, r=dvander)

MozReview-Commit-ID: 1Ru3lxaKUbl

--HG--
extra : rebase_source : df2fc3ecf68f8792945e4a3b72c23b7c9cfcc6fe

gfx/layers/client/ClientPaintedLayer.cpp

@@ -66,13 +66,7 @@ ClientPaintedLayer::CanRecordLayer(ReadbackProcessor* aReadback)
     return false;
   }
 
-  // If we have mask layers, we have to render those first
-  // In this case, don't record for now.
-  if (GetMaskLayer()) {
-    return false;
-  }
-
-  return GetAncestorMaskLayerCount() == 0;
+  return true;
 }
 
 void