cc: Make all layer recursion use CallFunctionForSubtree

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 "base/debug/trace_event.h"
 #include "cc/animation/keyframed_animation_curve.h"
 #include "cc/animation/scrollbar_animation_controller.h"
 #include "cc/debug/traced_value.h"
@@ skipping 332 matching lines @@
 void LayerTreeImpl::PushPersistedState(LayerTreeImpl* pending_tree) {
   int id = currently_scrolling_layer_ ? currently_scrolling_layer_->id() : 0;
   LayerImpl* pending_scrolling_layer_twin = NULL;
   if (pending_tree->root_layer()) {
     pending_scrolling_layer_twin =
         LayerTreeHostCommon::FindLayerInSubtree(pending_tree->root_layer(), id);
   }
   pending_tree->SetCurrentlyScrollingLayer(pending_scrolling_layer_twin);
 }
 
-static void DidBecomeActiveRecursive(LayerImpl* layer) {
+static void MarkActive(LayerImpl* layer) {
   layer->DidBecomeActive();
-  for (size_t i = 0; i < layer->children().size(); ++i)
-    DidBecomeActiveRecursive(layer->children()[i]);
 }
 
 void LayerTreeImpl::DidBecomeActive() {
   if (root_layer())
-    DidBecomeActiveRecursive(root_layer());
+    LayerTreeHostCommon::CallFunctionForSubtree(MarkActive, root_layer());
   FindRootScrollLayer();
   UpdateMaxScrollOffset();
 }
 
 bool LayerTreeImpl::ContentsTexturesPurged() const {
   return contents_textures_purged_;
 }
 
 void LayerTreeImpl::SetContentsTexturesPurged() {
   contents_textures_purged_ = true;
@@ skipping 192 matching lines @@
 
 void LayerTreeImpl::ClearLatencyInfo() {
   latency_info_.Clear();
 }
 
 void LayerTreeImpl::WillModifyTilePriorities() {
   layer_tree_host_impl_->tile_manager()->WillModifyTilePriorities();
 }
 
 }  // namespace cc