Overhaul tracing_ui to use XHR and new tracing_controller

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 10262929887658a21162eb4b55d20bf898f795e3..cb1c4852f9f5e9d9292a6d9181232009eaade8f3 100644
--- a/content/browser/tracing/tracing_controller_impl.h
+++ b/content/browser/tracing/tracing_controller_impl.h
@@ -44,6 +44,8 @@ class TracingControllerImpl : public TracingController {
   virtual void CaptureMonitoringSnapshot(
       const base::FilePath& result_file_path,
       const TracingFileResultCallback& callback) OVERRIDE;
+  virtual bool GetTraceBufferPercentFull(
+      const GetTraceBufferPercentFullCallback& callback) OVERRIDE;
 
  private:
   typedef std::set<scoped_refptr<TraceMessageFilter> > FilterMap;
@@ -72,6 +74,10 @@ class TracingControllerImpl : public TracingController {
         pending_capture_monitoring_snapshot_ack_count_ == 0;
   }
 
+  bool can_get_trace_buffer_percent_full() const {
+    return pending_trace_buffer_percent_full_callback_.is_null();
+  }
+
   // Methods for use by TraceMessageFilter.
   void AddFilter(TraceMessageFilter* filter);
   void RemoveFilter(TraceMessageFilter* filter);
@@ -94,16 +100,26 @@ class TracingControllerImpl : public TracingController {
       const std::vector<std::string>& known_category_groups);
   void OnCaptureMonitoringSnapshotAcked();
 
+  void OnTraceNotification(int notification);
+  void OnTraceBufferPercentFullReply(float percent_full);
+
   FilterMap filters_;
   // Pending acks for DisableRecording.
   int pending_disable_recording_ack_count_;
   // Pending acks for CaptureMonitoringSnapshot.
   int pending_capture_monitoring_snapshot_ack_count_;
+  // Pending acks for GetTraceBufferPercentFull.
+  int pending_trace_buffer_percent_full_ack_count_;
+  float maximum_trace_buffer_percent_full_;
+
   bool is_recording_;
   bool is_monitoring_;
+
   GetCategoriesDoneCallback pending_get_categories_done_callback_;
   TracingFileResultCallback pending_disable_recording_done_callback_;
   TracingFileResultCallback pending_capture_monitoring_snapshot_done_callback_;
+  GetTraceBufferPercentFullCallback pending_trace_buffer_percent_full_callback_;
+
   std::set<std::string> known_category_groups_;
   base::debug::CategoryFilter category_filter_;
   scoped_ptr<ResultFile> result_file_;