[DevTools] Filter any messages from previous sessions in DevToolsAgentHostImpl

content/browser/devtools/protocol/io_handler.h

Index: content/browser/devtools/protocol/io_handler.h
diff --git a/content/browser/devtools/protocol/io_handler.h b/content/browser/devtools/protocol/io_handler.h
index d6ae25baaa410572f540af46b86e94bd88d154e2..c74f9b7c3191589b75411c966467c10efcecceee 100644
--- a/content/browser/devtools/protocol/io_handler.h
+++ b/content/browser/devtools/protocol/io_handler.h
@@ -28,13 +28,18 @@ class IOHandler {
   void SetClient(scoped_ptr<Client> client);
 
   // Protocol methods.
-  Response Read(DevToolsCommandId command_id, const std::string& handle,
-      const int* offset, const int* max_size);
+  Response Read(int session_id,
+                DevToolsCommandId command_id,
+                const std::string& handle,
+                const int* offset,
+                const int* max_size);
   Response Close(const std::string& handle);
 
  private:
-  void ReadComplete(DevToolsCommandId command_id,
-      const scoped_refptr<base::RefCountedString>& data, int status);
+  void ReadComplete(int session_id,
+                    DevToolsCommandId command_id,
+                    const scoped_refptr<base::RefCountedString>& data,
+                    int status);
 
   scoped_ptr<Client> client_;
   DevToolsIOContext* io_context_;