cc: Simplify the logic for deciding to update tile priorities.

cc/layers/layer_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/layers/layer_impl.h"
 
 #include "base/debug/trace_event.h"
 #include "base/stringprintf.h"
 #include "base/values.h"
 #include "cc/animation/animation_registrar.h"
@@ skipping 607 matching lines @@
   if (replica_layer_)
     replica_layer_->set_parent(this);
   NoteLayerPropertyChangedForSubtree();
 }
 
 scoped_ptr<LayerImpl> LayerImpl::TakeReplicaLayer() {
   replica_layer_id_ = -1;
   return replica_layer_.Pass();
 }
 
+bool LayerImpl::NeedsFirstTimeUpdateTilePriorities() const {
+  return false;
+}
+
 ScrollbarLayerImpl* LayerImpl::ToScrollbarLayer() {
   return NULL;
 }
 
 void LayerImpl::SetDrawsContent(bool draws_content) {
   if (draws_content_ == draws_content)
     return;
 
   draws_content_ = draws_content;
   NoteLayerPropertyChanged();
@@ skipping 325 matching lines @@
   dict->Set("layer_quad", MathUtil::AsValue(layer_quad).release());
 }
 
 scoped_ptr<base::Value> LayerImpl::AsValue() const {
   scoped_ptr<base::DictionaryValue> state(new base::DictionaryValue());
   AsValueInto(state.get());
   return state.PassAs<base::Value>();
 }
 
 }  // namespace cc