(Reland) cc: Remove recycled tilings when active tree removes them.

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 392e80b658b041d71e09d53b63a164c90917945e..ee936022a04c17f507b8968a84c7ca39dbfcd65b 100644
--- a/cc/trees/layer_tree_impl.cc
+++ b/cc/trees/layer_tree_impl.cc
@@ -718,6 +718,13 @@ LayerImpl* LayerTreeImpl::FindPendingTreeLayerById(int id) {
   return tree->LayerById(id);
 }
 
+LayerImpl* LayerTreeImpl::FindRecycleTreeLayerById(int id) {
+  LayerTreeImpl* tree = layer_tree_host_impl_->recycle_tree();
+  if (!tree)
+    return NULL;
+  return tree->LayerById(id);
+}
+
 int LayerTreeImpl::MaxTextureSize() const {
   return layer_tree_host_impl_->GetRendererCapabilities().max_texture_size;
 }