Implements Windows system tracing.

content/public/browser/tracing_controller.h

 // Copyright 2013 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_PUBLIC_BROWSER_TRACING_CONTROLLER_H_
 #define CONTENT_PUBLIC_BROWSER_TRACING_CONTROLLER_H_
 
 #include <set>
 #include <string>
 
@@ skipping 132 matching lines @@
       const base::FilePath& result_file_path,
       const TracingFileResultCallback& callback) = 0;
 
   // Get the maximum across processes of trace buffer percent full state.
   // When the TraceBufferPercentFull value is determined, the callback is
   // called.
   typedef base::Callback<void(float)> GetTraceBufferPercentFullCallback;
   virtual bool GetTraceBufferPercentFull(
       const GetTraceBufferPercentFullCallback& callback) = 0;
 
-  // |callback| will will be called every time the given event occurs on any

[nduca, 2014/02/21 05:22:10]

by changing this file you are requiring an additional OWNER reviewer. I Would
suggest undoing the edit since its relatively minor [if anything at all?]

[etienneb, 2014/02/24 14:59:33]

Done.

+  // |callback| will be called every time the given event occurs on any
   // process.
   typedef base::Callback<void()> WatchEventCallback;
   virtual bool SetWatchEvent(const std::string& category_name,
                              const std::string& event_name,
                              const WatchEventCallback& callback) = 0;
 
   // Cancel the watch event. If tracing is enabled, this may race with the
   // watch event callback.
   virtual bool CancelWatchEvent() = 0;
 
  protected:
   virtual ~TracingController() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_TRACING_CONTROLLER_H_