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

Source/core/inspector/InspectorInstrumentation.cpp

 /*
 * Copyright (C) 2011 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 216 matching lines @@
 } // namespace InspectorInstrumentation
 
 namespace InstrumentationEvents {
 const char PaintSetup[] = "PaintSetup";
 const char PaintLayer[] = "PaintLayer";
 const char RasterTask[] = "RasterTask";
 const char ImageDecodeTask[] = "ImageDecodeTask";
 const char Paint[] = "Paint";
 const char Layer[] = "Layer";
 const char BeginFrame[] = "BeginFrame";
+const char UpdateLayer[] = "UpdateLayer";
 };
 
 namespace InstrumentationEventArguments {
 const char LayerId[] = "layerId";
+const char LayerTreeId[] = "layerTreeId";
+const char NodeId[] = "nodeId";
 const char PageId[] = "pageId";
-const char NodeId[] = "nodeId";
 };
 
 InstrumentingAgents* instrumentationForPage(Page* page)
 {
     ASSERT(isMainThread());
     if (InspectorController* controller = page->inspectorController())
         return controller->m_instrumentingAgents.get();
     return 0;
 }
 
 InstrumentingAgents* instrumentationForWorkerGlobalScope(WorkerGlobalScope* workerGlobalScope)
 {
     if (WorkerInspectorController* controller = workerGlobalScope->workerInspectorController())
         return controller->m_instrumentingAgents.get();
     return 0;
 }
 
 } // namespace WebCore