cc: Consolidate LayerList types.

cc/layers/layer.cc

 // Copyright 2010 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.h"
 
 #include <algorithm>
 
 #include "base/metrics/histogram.h"
 #include "cc/animation/animation.h"
@@ skipping 681 matching lines @@
   bounds_contain_page_scale_ = bounds_contain_page_scale;
   SetNeedsDisplay();
 }
 
 void Layer::CreateRenderSurface() {
   DCHECK(!draw_properties_.render_surface);
   draw_properties_.render_surface = make_scoped_ptr(new RenderSurface(this));
   draw_properties_.render_target = this;
 }
 
+void Layer::ClearRenderSurface() {
+  draw_properties_.render_surface.reset();
+}
+
 void Layer::OnOpacityAnimated(float opacity) {
   // This is called due to an ongoing accelerated animation. Since this
   // animation is also being run on the impl thread, there is no need to request
   // a commit to push this value over, so set the value directly rather than
   // calling SetOpacity.
   opacity_ = opacity;
 }
 
 void Layer::OnTransformAnimated(const gfx::Transform& transform) {
   // This is called due to an ongoing accelerated animation. Since this
@@ skipping 104 matching lines @@
 
 ScrollbarLayer* Layer::ToScrollbarLayer() {
   return NULL;
 }
 
 RenderingStatsInstrumentation* Layer::rendering_stats_instrumentation() const {
   return layer_tree_host_->rendering_stats_instrumentation();
 }
 
 }  // namespace cc