DevTools: expose setLayerTreeId() so we can relate events from LayerTreeHost

Source/core/inspector/InspectorTimelineAgent.cpp

 /*
 * 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 728 matching lines @@
     , m_memoryAgent(memoryAgent)
     , m_domAgent(domAgent)
     , m_frontend(0)
     , m_id(1)
     , m_maxCallStackDepth(5)
     , m_platformInstrumentationClientInstalledAtStackDepth(0)
     , m_inspectorType(type)
     , m_client(client)
     , m_weakFactory(this)
     , m_styleRecalcElementCounter(0)
+    , m_layerTreeId(0)
 {
 }
 
 void InspectorTimelineAgent::appendRecord(PassRefPtr<JSONObject> data, const String& type, bool captureCallStack, Frame* frame)
 {
     pushGCEventRecords();
     RefPtr<JSONObject> record = TimelineRecordFactory::createGenericRecord(timestamp(), captureCallStack ? m_maxCallStackDepth : 0, type);
     record->setObject("data", data);
     setFrameIdentifier(record.get(), frame);
     addRecordToTimeline(record.release());
@@ skipping 67 matching lines @@
     return m_timeConverter.fromMonotonicallyIncreasingTime(WTF::monotonicallyIncreasingTime());
 }
 
 Page* InspectorTimelineAgent::page()
 {
     return m_pageAgent ? m_pageAgent->page() : 0;
 }
 
 } // namespace WebCore