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

Source/core/inspector/TimelineTraceEventProcessor.h

Index: Source/core/inspector/TimelineTraceEventProcessor.h
diff --git a/Source/core/inspector/TimelineTraceEventProcessor.h b/Source/core/inspector/TimelineTraceEventProcessor.h
index 48edc097cdb76d8092e556b3f0eaad0cc8cabbb4..e45eb0c70ba73b63877ea4e8af9046e94207c607 100644
--- a/Source/core/inspector/TimelineTraceEventProcessor.h
+++ b/Source/core/inspector/TimelineTraceEventProcessor.h
@@ -228,23 +228,26 @@ private:
     void registerHandler(const char* name, TraceEventPhase, TraceEventHandler);
 
     void onBeginFrame(const TraceEvent&);
-    void onPaintSetupBegin(const TraceEvent&);
-    void onPaintSetupEnd(const TraceEvent&);
+    void onUpdateLayerBegin(const TraceEvent&);
+    void onUpdateLayerEnd(const TraceEvent&);
     void onPaintLayerBegin(const TraceEvent&);
     void onPaintLayerEnd(const TraceEvent&);
+    void onPaintSetupBegin(const TraceEvent&);
+    void onPaintSetupEnd(const TraceEvent&);
     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 onPaint(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;