Activate LayerImpl tree with sync+push instead of pointer swap

cc/delegated_renderer_layer_impl.h

 // Copyright 2012 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.
 
 #ifndef CC_DELEGATED_RENDERER_LAYER_IMPL_H_
 #define CC_DELEGATED_RENDERER_LAYER_IMPL_H_
 
+#include "base/memory/scoped_ptr.h"
 #include "cc/cc_export.h"
 #include "cc/layer_impl.h"
 #include "cc/scoped_ptr_vector.h"
 
 namespace cc {
 
 class CC_EXPORT DelegatedRendererLayerImpl : public LayerImpl {
  public:
   static scoped_ptr<DelegatedRendererLayerImpl> Create(
       LayerTreeImpl* tree_impl, int id) {
     return make_scoped_ptr(new DelegatedRendererLayerImpl(tree_impl, id));
   }
   virtual ~DelegatedRendererLayerImpl();
 
   // LayerImpl overrides.
+  virtual scoped_ptr<LayerImpl> createLayerImpl(LayerTreeImpl*) OVERRIDE;
   virtual bool hasDelegatedContent() const OVERRIDE;
   virtual bool hasContributingDelegatedRenderPasses() const OVERRIDE;
   virtual RenderPass::Id firstContributingRenderPassId() const OVERRIDE;
   virtual RenderPass::Id nextContributingRenderPassId(
       RenderPass::Id previous) const OVERRIDE;
   virtual void didLoseOutputSurface() OVERRIDE;
   virtual void appendQuads(
       QuadSink& quad_sink, AppendQuadsData& append_quads_data) OVERRIDE;
 
   // This gives ownership of the RenderPasses to the layer.
@@ skipping 24 matching lines @@
   virtual const char* layerTypeAsString() const OVERRIDE;
 
   ScopedPtrVector<RenderPass> render_passes_in_draw_order_;
   base::hash_map<RenderPass::Id, int> render_passes_index_by_id_;
   gfx::Size display_size_;
 };
 
 }
 
 #endif  // CC_DELEGATED_RENDERER_LAYER_IMPL_H_