Revert of DevTools: use explicit IPC messages for enabling/disabling tracing instead of intercepting protocol…

content/browser/devtools/devtools_tracing_handler.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_DEVTOOLS_DEVTOOLS_TRACING_HANDLER_H_
 #define CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_TRACING_HANDLER_H_
 
 #include <set>
 #include <string>
 
@@ skipping 12 matching lines @@
 // This class bridges DevTools remote debugging server with the trace
 // infrastructure.
 class DevToolsTracingHandler : public DevToolsProtocol::Handler {
  public:
   enum Target { Browser, Renderer };
   explicit DevToolsTracingHandler(Target target);
   virtual ~DevToolsTracingHandler();
 
   void OnClientDetached();
 
-  void EnableTracing(const std::string& category_filter);
-  void DisableTracing();
-
  private:
   void BeginReadingRecordingResult(const base::FilePath& path);
   void ReadRecordingResult(const scoped_refptr<base::RefCountedString>& result);
   void OnTraceDataCollected(const std::string& trace_fragment);
   void OnRecordingEnabled(scoped_refptr<DevToolsProtocol::Command> command);
   void OnBufferUsage(float usage);
 
   scoped_refptr<DevToolsProtocol::Response> OnStart(
       scoped_refptr<DevToolsProtocol::Command> command);
   scoped_refptr<DevToolsProtocol::Response> OnEnd(
       scoped_refptr<DevToolsProtocol::Command> command);
 
   scoped_refptr<DevToolsProtocol::Response> OnGetCategories(
       scoped_refptr<DevToolsProtocol::Command> command);
 
+  void OnTracingStarted(
+      scoped_refptr<DevToolsProtocol::Notification> notification);
+
+  void OnTracingStopped(
+      scoped_refptr<DevToolsProtocol::Notification> notification);
+
   void OnCategoriesReceived(scoped_refptr<DevToolsProtocol::Command> command,
                             const std::set<std::string>& category_set);
 
   base::debug::TraceOptions TraceOptionsFromString(const std::string& options);
 
   void SetupTimer(double usage_reporting_interval);
 
   void DisableRecording(
       const TracingController::TracingFileResultCallback& callback =
           TracingController::TracingFileResultCallback());
 
   base::WeakPtrFactory<DevToolsTracingHandler> weak_factory_;
   scoped_ptr<base::Timer> buffer_usage_poll_timer_;
   Target target_;
   bool is_recording_;
 
   static const char* kDefaultCategories;
   static const double kDefaultReportingInterval;
   static const double kMinimumReportingInterval;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsTracingHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_TRACING_HANDLER_H_