DevTools: Show GPU utilization bar on timeline

Source/core/inspector/TimelineTraceEventProcessor.h

 /*
 * Copyright (C) 2013 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
@@ skipping 201 matching lines @@
     void onRasterTaskBegin(const TraceEvent&);
     void onRasterTaskEnd(const TraceEvent&);
     void onPaint(const TraceEvent&);
     void onImageDecodeTaskBegin(const TraceEvent&);
     void onImageDecodeTaskEnd(const TraceEvent&);
     void onImageDecodeBegin(const TraceEvent&);
     void onImageDecodeEnd(const TraceEvent&);
     void onLayerDeleted(const TraceEvent&);
     void onDrawLazyPixelRef(const TraceEvent&);
     void onLazyPixelRefDeleted(const TraceEvent&);
+    void onGPUTaskBegin(const TraceEvent&);
+    void onGPUTaskEnd(const TraceEvent&);
 
     WeakPtr<InspectorTimelineAgent> m_timelineAgent;
     TimelineTimeConverter m_timeConverter;
     InspectorClient* m_inspectorClient;
     unsigned long long m_pageId;
     int m_layerTreeId;
 
     typedef HashMap<std::pair<String, int>, TraceEventHandler> HandlersMap;
     HandlersMap m_handlersByType;
     Mutex m_backgroundEventsMutex;
     Vector<TraceEvent> m_backgroundEvents;
     double m_lastEventProcessingTime;
     bool m_processEventsTaskInFlight;
 
     typedef HashMap<ThreadIdentifier, TimelineThreadState> ThreadStateMap;
     ThreadStateMap m_threadStates;
 
     HashMap<unsigned long long, long long> m_layerToNodeMap;
     unsigned long long m_layerId;
     double m_paintSetupStart;
     double m_paintSetupEnd;
+    RefPtr<JSONObject> m_gpuTask;
 
     struct ImageInfo {
         int backendNodeId;
         String url;
 
         ImageInfo() { }
         ImageInfo(int backendNodeId, String url) : backendNodeId(backendNodeId), url(url) { }
     };
     typedef HashMap<unsigned long long, ImageInfo> PixelRefToImageInfoMap;
     PixelRefToImageInfoMap m_pixelRefToImageInfo;
 };
 
 } // namespace WebCore
 
 #endif // !defined(TimelineTraceEventProcessor_h)