[cc] Show GPU memory usage and overage below FPS counter

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"
 #include "cc/font_atlas.h"
 #include "cc/layer_impl.h"
 #include "cc/scoped_resource.h"
 
 class SkCanvas;
 class SkPaint;
 struct SkRect;
 
 namespace cc {
 
 class DebugRectHistory;
 class FontAtlas;
 class FrameRateCounter;
+class MemoryHistory;
 class PaintTimeCounter;
 
 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();
 
@@ skipping 34 matching lines @@
 
     void drawHudContents(SkCanvas*);
 
     void drawTextLeftAligned(SkCanvas*, SkPaint*, const SkRect& bounds, const std::string& text);
     void drawTextRightAligned(SkCanvas*, SkPaint*, const SkRect& bounds, const std::string& text);
 
     void drawGraphBackground(SkCanvas*, SkPaint*, const SkRect& bounds);
     void drawGraphLines(SkCanvas*, SkPaint*, const SkRect& bounds, const Graph&);
 
     int drawFPSDisplay(SkCanvas*, FrameRateCounter*, const int& top);
+    int drawMemoryDisplay(SkCanvas*, MemoryHistory*, const int& top);
     int drawPaintTimeDisplay(SkCanvas*, PaintTimeCounter*, const int& top);
 
     void drawDebugRects(SkCanvas*, DebugRectHistory*);
 
     scoped_ptr<FontAtlas> m_fontAtlas;
     scoped_ptr<ScopedResource> m_hudTexture;
     scoped_ptr<SkCanvas> m_hudCanvas;
 
     Graph m_fpsGraph;
     Graph m_paintTimeGraph;
 
     base::TimeTicks m_timeOfLastGraphUpdate;
 };
 
 }  // namespace cc
 
 #endif  // CC_HEADS_UP_DISPLAY_LAYER_IMPL_H_