cc : Make CallFunctionForSubtree on impl use layer iterator

cc/trees/layer_tree_host.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_host.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 340 matching lines @@
 // after the commit, but on the main thread.
 void LayerTreeHost::FinishCommitOnImplThread(LayerTreeHostImpl* host_impl) {
   DCHECK(!IsRemoteServer());
   DCHECK(task_runner_provider_->IsImplThread());
 
   bool is_new_trace;
   TRACE_EVENT_IS_NEW_TRACE(&is_new_trace);
   if (is_new_trace &&
       frame_viewer_instrumentation::IsTracingLayerTreeSnapshots() &&
       root_layer()) {
-    LayerTreeHostCommon::CallFunctionForSubtree(
-        root_layer(), [](Layer* layer) { layer->DidBeginTracing(); });
+    LayerTreeHostCommon::CallFunctionForEveryLayer(
+        this, [](Layer* layer) { layer->DidBeginTracing(); });
   }
 
   LayerTreeImpl* sync_tree = host_impl->sync_tree();
 
   if (next_commit_forces_redraw_) {
     sync_tree->ForceRedrawNextActivation();
     next_commit_forces_redraw_ = false;
   }
 
   sync_tree->set_source_frame_number(source_frame_number());
@@ skipping 1187 matching lines @@
   // It is required to create new PropertyTrees before deserializing it.
   property_trees_ = PropertyTrees();
   property_trees_.FromProtobuf(proto.property_trees());
 
   // Forcefully override the sequence number of all layers in the tree to have
   // a valid sequence number. Changing the sequence number for a layer does not
   // need a commit, so the value will become out of date for layers that are not
   // updated for other reasons. All layers that at this point are part of the
   // layer tree are valid, so it is OK that they have a valid sequence number.
   int seq_num = property_trees_.sequence_number;
-  LayerTreeHostCommon::CallFunctionForSubtree(
-      root_layer(), [seq_num](Layer* layer) {
-        layer->set_property_tree_sequence_number(seq_num);
-      });
+  LayerTreeHostCommon::CallFunctionForEveryLayer(this, [seq_num](Layer* layer) {
+    layer->set_property_tree_sequence_number(seq_num);
+  });
 
   surface_id_namespace_ = proto.surface_id_namespace();
   next_surface_sequence_ = proto.next_surface_sequence();
 }
 
 }  // namespace cc