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diff --git a/content/renderer/devtools/devtools_agent.h b/content/renderer/devtools/devtools_agent.h
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+++ b/content/renderer/devtools/devtools_agent.h
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+// Copyright (c) 2012 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_RENDERER_DEVTOOLS_DEVTOOLS_AGENT_H_
+#define CONTENT_RENDERER_DEVTOOLS_DEVTOOLS_AGENT_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "content/public/common/console_message_level.h"
+#include "content/public/renderer/render_view_observer.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebDevToolsAgentClient.h"
+
+namespace WebKit {
+class WebDevToolsAgent;
+}
+
+namespace content {
+class RenderViewImpl;
+
+// DevToolsAgent belongs to the inspectable RenderView and provides Glue's
+// agents with the communication capabilities. All messages from/to Glue's
+// agents infrastructure are flowing through this communication agent.
+// There is a corresponding DevToolsClient object on the client side.
+class DevToolsAgent : public RenderViewObserver,
+                      public WebKit::WebDevToolsAgentClient {
+ public:
+  explicit DevToolsAgent(RenderViewImpl* render_view);
+  virtual ~DevToolsAgent();
+
+  // Returns agent instance for its host id.
+  static DevToolsAgent* FromHostId(int host_id);
+
+  WebKit::WebDevToolsAgent* GetWebAgent();
+
+  bool IsAttached();
+
+ private:
+  friend class DevToolsAgentFilter;
+
+  // RenderView::Observer implementation.
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+
+  // WebDevToolsAgentClient implementation
+  virtual void sendMessageToInspectorFrontend(const WebKit::WebString& data);
+
+  virtual int hostIdentifier();
+  virtual void saveAgentRuntimeState(const WebKit::WebString& state);
+  virtual WebKit::WebDevToolsAgentClient::WebKitClientMessageLoop*
+      createClientMessageLoop();
+  virtual void clearBrowserCache();
+  virtual void clearBrowserCookies();
+  virtual void visitAllocatedObjects(AllocatedObjectVisitor* visitor);
+
+  void OnAttach();
+  void OnReattach(const std::string& agent_state);
+  void OnDetach();
+  void OnDispatchOnInspectorBackend(const std::string& message);
+  void OnInspectElement(int x, int y);
+  void OnAddMessageToConsole(ConsoleMessageLevel level,
+                             const std::string& message);
+  void ContinueProgram();
+  void OnSetupDevToolsClient();
+
+  bool is_attached_;
+
+  DISALLOW_COPY_AND_ASSIGN(DevToolsAgent);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_DEVTOOLS_DEVTOOLS_AGENT_H_