toggle FPS counter in compositor

cc/layer_tree_host_impl.h

 // 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.
 
 #ifndef CCLayerTreeHostImpl_h
 #define CCLayerTreeHostImpl_h
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time.h"
@@ skipping 243 matching lines @@
         // Iterates in draw order, so that when a surface is removed, and its
         // target becomes empty, then its target can be removed also.
         size_t renderPassListBegin(const CCRenderPassList&) const { return 0; }
         size_t renderPassListEnd(const CCRenderPassList& list) const { return list.size(); }
         size_t renderPassListNext(size_t it) const { return it + 1; }
     };
 
     template<typename RenderPassCuller>
     static void removeRenderPasses(RenderPassCuller, FrameData&);
 
+    void setShowFPSCounter(bool show);
+    bool showFPSCounter() const;
+
 protected:
     CCLayerTreeHostImpl(const CCLayerTreeSettings&, CCLayerTreeHostImplClient*);
 
     void animatePageScale(double monotonicTime);
     void animateScrollbars(double monotonicTime);
 
     // Exposed for testing.
     void calculateRenderSurfaceLayerList(CCLayerList&);
 
     // Virtual for testing.
@@ skipping 44 matching lines @@
     IntSize m_layoutViewportSize;
     IntSize m_deviceViewportSize;
     float m_deviceScaleFactor;
     bool m_visible;
     bool m_contentsTexturesPurged;
     size_t m_memoryAllocationLimitBytes;
 
     SkColor m_backgroundColor;
     bool m_hasTransparentBackground;
 
+    bool m_showFPSCounter;
+
     // If this is true, it is necessary to traverse the layer tree ticking the animators.
     bool m_needsAnimateLayers;
     bool m_pinchGestureActive;
     IntPoint m_previousPinchAnchor;
 
     scoped_ptr<CCPageScaleAnimation> m_pageScaleAnimation;
 
     // This is used for ticking animations slowly when hidden.
     scoped_ptr<CCLayerTreeHostImplTimeSourceAdapter> m_timeSourceClientAdapter;
 
@@ skipping 10 matching lines @@
 
     size_t m_numImplThreadScrolls;
     size_t m_numMainThreadScrolls;
 
     DISALLOW_COPY_AND_ASSIGN(CCLayerTreeHostImpl);
 };
 
 }  // namespace cc
 
 #endif