Add a mechanism to let TracingController invoke JavaScript via TracingUI

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>
 
 #include "base/callback.h"
 #include "content/common/content_export.h"
 
 namespace base {
 class FilePath;
 };
 
 namespace content {
 
 class TracingController;
+class TracingUI;

[jam, 2014/01/10 20:24:58]

remove

 
 // TracingController is used on the browser processes to enable/disable
 // trace status and collect trace data. Only the browser UI thread is allowed
 // to interact with the TracingController object. All callbacks are called on
 // the UI thread.
 class TracingController {
  public:
   enum Options {
     DEFAULT_OPTIONS = 0,
     ENABLE_SYSTRACE = 1 << 0,
@@ skipping 130 matching lines @@
   // watch event callback.
   virtual bool CancelWatchEvent() = 0;
 
  protected:
   virtual ~TracingController() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_TRACING_CONTROLLER_H_