[DevTools] Filter any messages from previous sessions in DevToolsAgentHostImpl

content/browser/devtools/protocol/system_info_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_SYSTEM_INFO_HANDLER_H_
 #define CONTENT_BROWSER_DEVTOOLS_PROTOCOL_SYSTEM_INFO_HANDLER_H_
 
 #include <set>
 
 #include "content/browser/devtools/protocol/devtools_protocol_dispatcher.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/gpu_data_manager_observer.h"
 
 namespace content {
 namespace devtools {
 namespace system_info {
 
 class SystemInfoHandler {
  public:
   using Response = DevToolsProtocolClient::Response;
 
   SystemInfoHandler();
   ~SystemInfoHandler();
 
   void SetClient(scoped_ptr<Client> client);
 
-  Response GetInfo(DevToolsCommandId command_id);
+  Response GetInfo(int session_id, DevToolsCommandId command_id);
 
  private:
   friend class SystemInfoHandlerGpuObserver;
 
-  void SendGetInfoResponse(DevToolsCommandId command_id);
+  void SendGetInfoResponse(int session_id, DevToolsCommandId command_id);
 
   // Bookkeeping for the active GpuObservers.
   void AddActiveObserverId(int observer_id);
   bool RemoveActiveObserverId(int observer_id);
-  void ObserverWatchdogCallback(int observer_id, DevToolsCommandId command_id);
+  void ObserverWatchdogCallback(int observer_id,
+                                int session_id,
+                                DevToolsCommandId command_id);
 
   // For robustness, we have to guarantee a response to getInfo requests.
   // It's very unlikely that the requests will time out. The
   // GpuDataManager's threading model is not well defined (see comments in
   // gpu_data_manager_impl.h) and it is very difficult to correctly clean
   // up its observers. For the moment, especially since these classes are
   // only used in tests, we leak a little bit of memory if we don't get a
   // callback from the GpuDataManager in time.
   mutable base::Lock lock_;
   std::set<int> active_observers_;
 
   scoped_ptr<Client> client_;
   base::WeakPtrFactory<SystemInfoHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemInfoHandler);
 };
 
 }  // namespace system_info
 }  // namespace devtools
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_PROTOCOL_SYSTEM_INFO_HANDLER_H_