[DevTools] Filter any messages from previous sessions in DevToolsAgentHostImpl

content/browser/devtools/protocol/system_info_handler.h

Index: content/browser/devtools/protocol/system_info_handler.h
diff --git a/content/browser/devtools/protocol/system_info_handler.h b/content/browser/devtools/protocol/system_info_handler.h
index 8131c9e2d083e247a86f5ca3734b37cf25d7314a..b9dc5b694a605c5559063a7b0e9b6ecdc25d8a1e 100644
--- a/content/browser/devtools/protocol/system_info_handler.h
+++ b/content/browser/devtools/protocol/system_info_handler.h
@@ -24,17 +24,19 @@ class 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