toggle FPS counter in compositor

cc/heads_up_display_layer.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 HeadsUpDisplayLayerChromium_h
 #define HeadsUpDisplayLayerChromium_h
 
 #include "IntSize.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/font_atlas.h"
 #include "cc/layer.h"
 
 namespace cc {
 
 class HeadsUpDisplayLayer : public Layer {
 public:
     static scoped_refptr<HeadsUpDisplayLayer> create();
 
     virtual void update(ResourceUpdateQueue&, const OcclusionTracker*, RenderingStats&) OVERRIDE;
     virtual bool drawsContent() const OVERRIDE;
 
     void setFontAtlas(scoped_ptr<FontAtlas>);
+    void setShowFPSCounter(bool);
 
     virtual scoped_ptr<LayerImpl> createLayerImpl() OVERRIDE;
     virtual void pushPropertiesTo(LayerImpl*) OVERRIDE;
 
 protected:
     HeadsUpDisplayLayer();
 
 private:
     virtual ~HeadsUpDisplayLayer();
 
     scoped_ptr<FontAtlas> m_fontAtlas;
+    bool m_showFPSCounter;
 };
 
 }  // namespace cc
 
 #endif