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diff --git a/chrome/renderer/external_host_bindings.h b/chrome/renderer/external_host_bindings.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef CHROME_RENDERER_EXTERNAL_HOST_BINDINGS_H__
+#define CHROME_RENDERER_EXTERNAL_HOST_BINDINGS_H__
+
+#include "chrome/common/ipc_message.h"
+#include "webkit/glue/cpp_bound_class.h"
+
+// ExternalHostBindings is the class backing the "externalHost" object
+// accessible from Javascript
+//
+// We expose one function, for sending a message to the external host:
+//  postMessage(String receiver, String message);
+class ExternalHostBindings : public CppBoundClass {
+ public:
+  ExternalHostBindings();
+  ~ExternalHostBindings();
+
+  // The postMessage() function provided to Javascript.
+  void postMessage(const CppArgumentList& args, CppVariant* result);
+
+  // Set the message channel back to the browser.
+  void set_message_sender(IPC::Message::Sender* sender) {
+    sender_ = sender;
+  }
+
+  // Set the routing id for messages back to the browser.
+  void set_routing_id(int routing_id) {
+    routing_id_ = routing_id;
+  }
+
+  // Sets a property with the given name and value.
+  void SetProperty(const std::string& name, const std::string& value);
+
+ private:
+  // Our channel back to the browser is a message sender
+  // and routing id.
+  IPC::Message::Sender* sender_;
+  int routing_id_;
+
+  // The list of properties that have been set.  We keep track of this so we
+  // can free them on destruction.
+  typedef std::vector<CppVariant*> PropertyList;
+  PropertyList properties_;
+};
+
+#endif  // CHROME_RENDERER_DOM_UI_BINDINGS_H__