cc: Make sure mask and replica layers get DidBecomeActive signal.

cc/trees/layer_tree_impl.cc

Index: cc/trees/layer_tree_impl.cc
diff --git a/cc/trees/layer_tree_impl.cc b/cc/trees/layer_tree_impl.cc
index c054b783c196408aebbca92e74457579762d2b57..759b80ef3feaca7a3288480153e84fb8e889e1d8 100644
--- a/cc/trees/layer_tree_impl.cc
+++ b/cc/trees/layer_tree_impl.cc
@@ -579,6 +579,11 @@ void LayerTreeImpl::PushPersistedState(LayerTreeImpl* pending_tree) {
 
 static void DidBecomeActiveRecursive(LayerImpl* layer) {
   layer->DidBecomeActive();
+  if (layer->mask_layer())
+    layer->mask_layer()->DidBecomeActive();
+  if (layer->replica_layer() && layer->replica_layer()->mask_layer())
+    layer->replica_layer()->mask_layer()->DidBecomeActive();
+
   for (size_t i = 0; i < layer->children().size(); ++i)
     DidBecomeActiveRecursive(layer->children()[i]);
 }