DevTools: add Tracing agent on back-end

Source/core/inspector/InspectorTimelineAgent.h

 /*
 * Copyright (C) 2012 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 109 matching lines @@
     {
         return adoptPtr(new InspectorTimelineAgent(pageAgent, domAgent, layerTreeAgent, overlay, type, client));
     }
 
     virtual ~InspectorTimelineAgent();
 
     virtual void setFrontend(InspectorFrontend*) OVERRIDE;
     virtual void clearFrontend() OVERRIDE;
     virtual void restore() OVERRIDE;
 
-    virtual void enable(ErrorString*, const String* traceEventCategoryFilter) OVERRIDE;
+    virtual void enable(ErrorString*) OVERRIDE;
     virtual void disable(ErrorString*) OVERRIDE;
     virtual void start(ErrorString*, const int* maxCallStackDepth, const bool* bufferEvents, const String* liveEvents, const bool* includeCounters, const bool* includeGPUEvents) OVERRIDE;
     virtual void stop(ErrorString*, RefPtr<TypeBuilder::Array<TypeBuilder::Timeline::TimelineEvent> >& events) OVERRIDE;
 
     void setLayerTreeId(int layerTreeId) { m_layerTreeId = layerTreeId; }
     int id() const { return m_id; }
 
     void didCommitLoad();
 
     // Methods called from WebCore.
@@ skipping 179 matching lines @@
     double m_paintSetupStart;
     double m_paintSetupEnd;
     RefPtr<JSONObject> m_gpuTask;
     RefPtr<JSONValue> m_pendingLayerTreeData;
     unsigned m_styleRecalcElementCounter;
     typedef HashMap<ThreadIdentifier, TimelineThreadState> ThreadStateMap;
     ThreadStateMap m_threadStates;
     bool m_mayEmitFirstPaint;
     HashSet<String> m_liveEvents;
     double m_lastProgressTimestamp;
-    bool m_disableTracingOnStop;
 };
 
 } // namespace WebCore
 
 #endif // !defined(InspectorTimelineAgent_h)