Timeline: produce session cookie when timeline is started

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 114 matching lines @@
 
     virtual void setFrontend(InspectorFrontend*) OVERRIDE;
     virtual void clearFrontend() OVERRIDE;
     virtual void restore() OVERRIDE;
 
     virtual void enable(ErrorString*, const String* traceEventCategoryFilter) 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; }
+    void setLayerTreeId(int);
     int id() const { return m_id; }
 
     void didCommitLoad();
 
     // Methods called from WebCore.
     bool willCallFunction(ExecutionContext*, int scriptId, const String& scriptName, int scriptLine);
     void didCallFunction();
 
     bool willDispatchEvent(Document* document, const Event& event, DOMWindow* window, Node* node, const EventPath& eventPath);
     bool willDispatchEventOnWindow(const Event& event, DOMWindow* window);
@@ skipping 131 matching lines @@
     void innerAddRecordToTimeline(PassRefPtr<TypeBuilder::Timeline::TimelineEvent>);
     PassRefPtr<TypeBuilder::Timeline::TimelineEvent> createCountersUpdate();
     void clearRecordStack();
     PassRefPtr<TypeBuilder::Timeline::TimelineEvent> createRecordForEvent(const TraceEventDispatcher::TraceEvent&, const String& type, PassRefPtr<JSONObject> data);
 
     void localToPageQuad(const RenderObject& renderer, const LayoutRect&, FloatQuad*);
     long long nodeId(Node*);
     long long nodeId(RenderObject*);
     void releaseNodeIds();
 
+    void initializeSessionId();
+    String sessionId() const;
+
     double timestamp();
 
     LocalFrame* mainFrame() const;
 
     bool isStarted();
     void innerStart();
     void innerStop(bool fromConsole);
     void setLiveEvents(const String&);
 
     InspectorPageAgent* m_pageAgent;
@@ skipping 29 matching lines @@
     ThreadStateMap m_threadStates;
     bool m_mayEmitFirstPaint;
     HashSet<String> m_liveEvents;
     double m_lastProgressTimestamp;
     bool m_disableTracingOnStop;
 };
 
 } // namespace WebCore
 
 #endif // !defined(InspectorTimelineAgent_h)