cc: Move UI Resource management out of LayerTreeHost.

cc/trees/layer_tree_impl.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/trees/layer_tree_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1538 matching lines @@
     // |persistent_swap_promises| must remain active even when swap fails.
     pinned_swap_promise_list_ = std::move(persistent_swap_promises);
   }
 }
 
 void LayerTreeImpl::DidModifyTilePriorities() {
   layer_tree_host_impl_->DidModifyTilePriorities();
 }
 
 void LayerTreeImpl::set_ui_resource_request_queue(
-    const UIResourceRequestQueue& queue) {
-  ui_resource_request_queue_ = queue;
+    UIResourceRequestQueue queue) {
+  ui_resource_request_queue_ = std::move(queue);
 }
 
 ResourceId LayerTreeImpl::ResourceIdForUIResource(UIResourceId uid) const {
   return layer_tree_host_impl_->ResourceIdForUIResource(uid);
 }
 
 bool LayerTreeImpl::IsUIResourceOpaque(UIResourceId uid) const {
   return layer_tree_host_impl_->IsUIResourceOpaque(uid);
 }
 
@@ skipping 505 matching lines @@
 
 void LayerTreeImpl::ResetAllChangeTracking() {
   layers_that_should_push_properties_.clear();
   // Iterate over all layers, including masks and replicas.
   for (auto& layer : *layers_)
     layer->ResetChangeTracking();
   property_trees_.ResetAllChangeTracking();
 }
 
 }  // namespace cc