Add a mechanism to let TracingController invoke JavaScript via TracingUI

content/browser/tracing/tracing_controller_impl.h

Index: content/browser/tracing/tracing_controller_impl.h
diff --git a/content/browser/tracing/tracing_controller_impl.h b/content/browser/tracing/tracing_controller_impl.h
index 0684373a96192c170d79a3e8a4d19429c2157172..da6039db9996a6a9c4e16ef0eff2b2aa88074aac 100644
--- a/content/browser/tracing/tracing_controller_impl.h
+++ b/content/browser/tracing/tracing_controller_impl.h
@@ -20,6 +20,7 @@ class RefCountedString;
 namespace content {
 
 class TraceMessageFilter;
+class TracingUI;
 
 class TracingControllerImpl : public TracingController {
  public:
@@ -54,6 +55,9 @@ class TracingControllerImpl : public TracingController {
                              const WatchEventCallback& callback) OVERRIDE;
   virtual bool CancelWatchEvent() OVERRIDE;
 
+  void RegisterTracingUI(TracingUI* tracing_ui);
+  void UnregisterTracingUI(TracingUI* tracing_ui);
+
  private:
   typedef std::set<scoped_refptr<TraceMessageFilter> > TraceMessageFilterSet;
   class ResultFile;
@@ -136,6 +140,8 @@ class TracingControllerImpl : public TracingController {
                               const EnableMonitoringDoneCallback& callback);
   void OnDisableMonitoringDone(const DisableMonitoringDoneCallback& callback);
 
+  void OnMonitoringStateChanged(bool is_monitoring);
+
   TraceMessageFilterSet trace_message_filters_;
 
   // Pending acks for DisableRecording.
@@ -162,6 +168,7 @@ class TracingControllerImpl : public TracingController {
   WatchEventCallback watch_event_callback_;
 
   std::set<std::string> known_category_groups_;
+  std::set<TracingUI*> tracing_uis_;
   scoped_ptr<ResultFile> result_file_;
   scoped_ptr<ResultFile> monitoring_snapshot_file_;
   DISALLOW_COPY_AND_ASSIGN(TracingControllerImpl);