Activate LayerImpl tree with sync+push instead of pointer swap

cc/heads_up_display_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_HEADS_UP_DISPLAY_LAYER_IMPL_H_
 #define CC_HEADS_UP_DISPLAY_LAYER_IMPL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/time.h"
 #include "cc/cc_export.h"
@@ skipping 15 matching lines @@
 class CC_EXPORT HeadsUpDisplayLayerImpl : public LayerImpl {
 public:
     static scoped_ptr<HeadsUpDisplayLayerImpl> create(LayerTreeImpl* treeImpl, int id)
     {
         return make_scoped_ptr(new HeadsUpDisplayLayerImpl(treeImpl, id));
     }
     virtual ~HeadsUpDisplayLayerImpl();
 
     void setFontAtlas(scoped_ptr<FontAtlas>);
 
+    virtual scoped_ptr<LayerImpl> createLayerImpl(LayerTreeImpl* treeImpl) OVERRIDE;
+    virtual void pushPropertiesTo(LayerImpl*) OVERRIDE;
+
     virtual void willDraw(ResourceProvider*) OVERRIDE;
     virtual void appendQuads(QuadSink&, AppendQuadsData&) OVERRIDE;
     void updateHudTexture(ResourceProvider*);
     virtual void didDraw(ResourceProvider*) OVERRIDE;
 
     virtual void didLoseOutputSurface() OVERRIDE;
 
     virtual bool layerIsAlwaysDamaged() const OVERRIDE;
 
 private:
@@ skipping 36 matching lines @@
 
     Graph m_fpsGraph;
     Graph m_paintTimeGraph;
 
     base::TimeTicks m_timeOfLastGraphUpdate;
 };
 
 }  // namespace cc
 
 #endif  // CC_HEADS_UP_DISPLAY_LAYER_IMPL_H_