implement SetWatchEvent and WaitForEvent for trace-based-tests

content/browser/trace_message_filter.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_TRACE_MESSAGE_FILTER_H_
 #define CONTENT_BROWSER_TRACE_MESSAGE_FILTER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 11 matching lines @@
 
   // content::BrowserMessageFilter implementation.
   virtual void OnChannelClosing() OVERRIDE;
   virtual bool OnMessageReceived(const IPC::Message& message,
                                  bool* message_was_ok) OVERRIDE;
 
   void SendBeginTracing(const std::vector<std::string>& included_categories,
                         const std::vector<std::string>& excluded_categories);
   void SendEndTracing();
   void SendGetTraceBufferPercentFull();
+  void SendSetWatchEvent(const std::string& category_name,
+                         const std::string& event_name);
+  void SendCancelWatchEvent();
 
  protected:
   virtual ~TraceMessageFilter();
 
  private:
   // Message handlers.
   void OnChildSupportsTracing();
   void OnEndTracingAck(const std::vector<std::string>& known_categories);
-  void OnTraceBufferFull();
+  void OnTraceNotification(int notification);
   void OnTraceBufferPercentFullReply(float percent_full);
   void OnTraceDataCollected(const std::string& data);
 
   // ChildTraceMessageFilter exists:
   bool has_child_;
 
   // Awaiting ack for previously sent SendEndTracing
   bool is_awaiting_end_ack_;
   // Awaiting ack for previously sent SendGetTraceBufferPercentFull
   bool is_awaiting_buffer_percent_full_ack_;
 
   DISALLOW_COPY_AND_ASSIGN(TraceMessageFilter);
 };
 
 #endif  // CONTENT_BROWSER_TRACE_MESSAGE_FILTER_H_