Introduce DevToolsExternalAgentProxy interface

content/browser/devtools/ipc_devtools_agent_host.h

+// Copyright (c) 2013 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_IPC_DEVTOOLS_DEVTOOLS_AGENT_HOST_H_
+#define CONTENT_BROWSER_IPC_DEVTOOLS_DEVTOOLS_AGENT_HOST_H_
+
+#include "content/browser/devtools/devtools_agent_host_impl.h"
+
+namespace IPC {
+class Message;
+}
+
+namespace content {
+
+class CONTENT_EXPORT IPCDevToolsAgentHost : public DevToolsAgentHostImpl {
+ public:
+  // DevToolsAgentHostImpl implementation.
+  virtual void Attach() OVERRIDE;
+  virtual void Detach() OVERRIDE;
+  virtual void DispatchOnInspectorBackend(const std::string& message) OVERRIDE;
+  virtual void InspectElement(int x, int y) OVERRIDE;
+
+ protected:
+  void Reattach(const std::string& saved_agent_state);
+
+  virtual void SendMessageToAgent(IPC::Message* msg) = 0;
+  virtual void NotifyClientAttaching() = 0;
+  virtual void NotifyClientDetaching() = 0;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_IPC_DEVTOOLS_DEVTOOLS_AGENT_HOST_H_