DevTools: Show GPU utilization bar on timeline

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 8b4d99d5c114c106b72337f580c04d6fdd76cd75..b2b634dc34c2e93cbffcfd101e6b6e3804eca79b 100644
--- a/Source/core/inspector/TimelineTraceEventProcessor.h
+++ b/Source/core/inspector/TimelineTraceEventProcessor.h
@@ -81,7 +81,7 @@ private:
 
 class TimelineTraceEventProcessor : public ThreadSafeRefCounted<TimelineTraceEventProcessor> {
 public:
-    TimelineTraceEventProcessor(WeakPtr<InspectorTimelineAgent>, InspectorClient*);
+    TimelineTraceEventProcessor(WeakPtr<InspectorTimelineAgent>, InspectorClient*, bool collectGpuEvents);

[caseq, 2013/11/01 13:04:20]

do we have to pass this? can we pull it from timeline instead?

[alph, 2013/11/01 16:40:19]

Done.

     ~TimelineTraceEventProcessor();
 
     void shutdown();
@@ -219,6 +219,8 @@ private:
     void onLayerDeleted(const TraceEvent&);
     void onDrawLazyPixelRef(const TraceEvent&);
     void onLazyPixelRefDeleted(const TraceEvent&);
+    void onGpuTaskBegin(const TraceEvent&);
+    void onGpuTaskEnd(const TraceEvent&);
 
     WeakPtr<InspectorTimelineAgent> m_timelineAgent;
     TimelineTimeConverter m_timeConverter;
@@ -240,6 +242,8 @@ private:
     unsigned long long m_layerId;
     double m_paintSetupStart;
     double m_paintSetupEnd;
+    double m_gpuTaskStart;
+    unsigned m_gpuTaskRendererPid;
 
     struct ImageInfo {
         int backendNodeId;