Bug 1065008 - Consider the shadow transform when computing the opaque rect to use for culling. r=roc

--HG--
extra : rebase_source : 2b162f272016193e2af3316c9f18d37125050863

gfx/layers/composite/ContainerLayerComposite.cpp

@@ -57,7 +57,7 @@ GetOpaqueRect(Layer* aLayer)
 {
   nsIntRect result;
   gfx::Matrix matrix;
-  bool is2D = aLayer->GetBaseTransform().Is2D(&matrix);
+  bool is2D = aLayer->AsLayerComposite()->GetShadowTransform().Is2D(&matrix);
 
   // Just bail if there's anything difficult to handle.
   if (!is2D || aLayer->GetMaskLayer() ||