Initial import.

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diff --git a/chromium/content/renderer/devtools/devtools_agent_filter.h b/chromium/content/renderer/devtools/devtools_agent_filter.h
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+++ b/chromium/content/renderer/devtools/devtools_agent_filter.h
@@ -0,0 +1,51 @@
+// 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_FILTER_H_
+#define CONTENT_RENDERER_DEVTOOLS_DEVTOOLS_AGENT_FILTER_H_
+
+#include <string>
+
+#include "ipc/ipc_channel_proxy.h"
+
+struct DevToolsMessageData;
+
+namespace base {
+class MessageLoop;
+}
+
+namespace content {
+
+// DevToolsAgentFilter is registered as an IPC filter in order to be able to
+// dispatch messages while on the IO thread. The reason for that is that while
+// debugging, Render thread is being held by the v8 and hence no messages
+// are being dispatched there. While holding the thread in a tight loop,
+// v8 provides thread-safe Api for controlling debugger. In our case v8's Api
+// is being used from this communication agent on the IO thread.
+class DevToolsAgentFilter : public IPC::ChannelProxy::MessageFilter {
+ public:
+  // There is a single instance of this class instantiated by the RenderThread.
+  DevToolsAgentFilter();
+
+  static void SendRpcMessage(const DevToolsMessageData& data);
+
+  // IPC::ChannelProxy::MessageFilter override. Called on IO thread.
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+
+ protected:
+  virtual ~DevToolsAgentFilter();
+
+ private:
+  void OnDispatchOnInspectorBackend(const std::string& message);
+
+  bool message_handled_;
+  base::MessageLoop* render_thread_loop_;
+  int current_routing_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(DevToolsAgentFilter);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_DEVTOOLS_DEVTOOLS_AGENT_FILTER_H_