[DevTools] Filter any messages from previous sessions in DevToolsAgentHostImpl

content/browser/devtools/protocol/tracing_handler.h

 // Copyright 2014 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_PROTOCOL_TRACING_HANDLER_H_
 #define CONTENT_BROWSER_DEVTOOLS_PROTOCOL_TRACING_HANDLER_H_
 
 #include <set>
 #include <string>
 
@@ skipping 23 matching lines @@
   virtual ~TracingHandler();
 
   void SetClient(scoped_ptr<Client> client);
   void Detached();
 
   void OnTraceDataCollected(const std::string& trace_fragment);
   void OnTraceComplete();
   void OnTraceToStreamComplete(const std::string& stream_handle);
 
   // Protocol methods.
-  Response Start(DevToolsCommandId command_id,
+  Response Start(int session_id,
+                 DevToolsCommandId command_id,
                  const std::string* categories,
                  const std::string* options,
                  const double* buffer_usage_reporting_interval,
                  const std::string* transfer_mode);
-  Response End(DevToolsCommandId command_id);
-  Response GetCategories(DevToolsCommandId command);
-  Response RequestMemoryDump(DevToolsCommandId command_id);
+  Response End(int session_id, DevToolsCommandId command_id);
+  Response GetCategories(int session_id, DevToolsCommandId command);
+  Response RequestMemoryDump(int session_id, DevToolsCommandId command_id);
 
   bool did_initiate_recording() { return did_initiate_recording_; }
 
  private:
-  void OnRecordingEnabled(DevToolsCommandId command_id);
+  void OnRecordingEnabled(int session_id, DevToolsCommandId command_id);
   void OnBufferUsage(float percent_full, size_t approximate_event_count);
-  void OnCategoriesReceived(DevToolsCommandId command_id,
+  void OnCategoriesReceived(int session_id,
+                            DevToolsCommandId command_id,
                             const std::set<std::string>& category_set);
-  void OnMemoryDumpFinished(DevToolsCommandId command_id,
+  void OnMemoryDumpFinished(int session_id,
+                            DevToolsCommandId command_id,
                             uint64 dump_guid,
                             bool success);
 
   void SetupTimer(double usage_reporting_interval);
   void DisableRecording(
       const scoped_refptr<TracingController::TraceDataSink>& trace_data_sink);
   bool IsRecording() const;
   static bool IsStartupTracingActive();
 
   scoped_ptr<base::Timer> buffer_usage_poll_timer_;
   Target target_;
 
   scoped_ptr<Client> client_;
   DevToolsIOContext* io_context_;
   bool did_initiate_recording_;
   bool return_as_stream_;
   base::WeakPtrFactory<TracingHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TracingHandler);
 };
 
 }  // namespace tracing
 }  // namespace devtools
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_PROTOCOL_TRACING_HANDLER_H_