cc: Replace recorded region with direct map lookup

cc/layers/picture_layer.cc

Index: cc/layers/picture_layer.cc
diff --git a/cc/layers/picture_layer.cc b/cc/layers/picture_layer.cc
index ec73e0913d91cecf324ad6c6cf601d274f15da46..7072f4f552734785e880e8b13181438d97452d59 100644
--- a/cc/layers/picture_layer.cc
+++ b/cc/layers/picture_layer.cc
@@ -43,7 +43,6 @@ void PictureLayer::PushPropertiesTo(LayerImpl* base_layer) {
     // Using layer_impl because either bounds() or paint_properties().bounds
     // may disagree and either one could have been pushed to layer_impl.
     pile_->Resize(gfx::Size());
-    pile_->UpdateRecordedRegion();
   } else if (update_source_frame_number_ ==
              layer_tree_host()->source_frame_number()) {
     // If update called, then pile size must match bounds pushed to impl layer.