implement SetWatchEvent and WaitForEvent for trace-based-tests

content/common/child_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_COMMON_CHILD_TRACE_MESSAGE_FILTER_H_
 #define CONTENT_COMMON_CHILD_TRACE_MESSAGE_FILTER_H_
 
 #include <string>
 
 #include "base/debug/trace_event.h"
@@ skipping 12 matching lines @@
 
  protected:
   virtual ~ChildTraceMessageFilter();
 
  private:
   // Message handlers.
   void OnBeginTracing(const std::vector<std::string>& included_categories,
                       const std::vector<std::string>& excluded_categories);
   void OnEndTracing();
   void OnGetTraceBufferPercentFull();
+  void OnSetWatchEvent(const std::string& category_name,
+                       const std::string& event_name);
+  void OnCancelWatchEvent();
 
   // Callback from trace subsystem.
   void OnTraceDataCollected(
       const scoped_refptr<base::RefCountedString>& events_str_ptr);
-  void OnTraceBufferFull();
+  void OnTraceNotification(int notification);
 
   IPC::Channel* channel_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildTraceMessageFilter);
 };
 
 
 #endif  // CONTENT_COMMON_CHILD_TRACE_MESSAGE_FILTER_H_