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diff --git a/chrome/common/speech_input_messages.h b/chrome/common/speech_input_messages.h
new file mode 100644
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+++ b/chrome/common/speech_input_messages.h
@@ -0,0 +1,93 @@
+// Copyright (c) 2011 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 CHROME_COMMON_SPEECH_INPUT_MESSAGES_H_
+#define CHROME_COMMON_SPEECH_INPUT_MESSAGES_H_
+#pragma once
+
+#include "chrome/common/speech_input_result.h"
+#include "gfx/rect.h"
+#include "ipc/ipc_message_macros.h"
+#include "ipc/ipc_param_traits.h"
+
+#define IPC_MESSAGE_START SpeechInputMsgStart
+
+namespace speech_input {
+struct SpeechInputResultItem;
+}
+
+// Used to start a speech recognition session.
+struct SpeechInputHostMsg_StartRecognition_Params {
+  SpeechInputHostMsg_StartRecognition_Params();
+  ~SpeechInputHostMsg_StartRecognition_Params();
+
+  int render_view_id;  // The render view requesting speech recognition.
+  int request_id;  // Request ID used within the render view.
+  gfx::Rect element_rect;  // Position of the UI element in page coordinates.
+  std::string language;  // Language to use for speech recognition.
+  std::string grammar;  // Speech grammar given by the speech input element.
+  std::string origin_url;  // URL of the page (or iframe if applicable).
+};
+
+namespace IPC {
+
+template <>
+struct ParamTraits<speech_input::SpeechInputResultItem> {
+  typedef speech_input::SpeechInputResultItem param_type;
+  static void Write(Message* m, const param_type& p);
+  static bool Read(const Message* m, void** iter, param_type* p);
+  static void Log(const param_type& p, std::string* l);
+};
+
+template <>
+struct ParamTraits<SpeechInputHostMsg_StartRecognition_Params> {
+  typedef SpeechInputHostMsg_StartRecognition_Params param_type;
+  static void Write(Message* m, const param_type& p);
+  static bool Read(const Message* m, void** iter, param_type* p);
+  static void Log(const param_type& p, std::string* l);
+};
+
+}  // namespace IPC
+
+// Speech input messages sent from the renderer to the browser.
+
+// Requests the speech input service to start speech recognition on behalf of
+// the given |render_view_id|.
+IPC_MESSAGE_CONTROL1(SpeechInputHostMsg_StartRecognition,
+                     SpeechInputHostMsg_StartRecognition_Params)
+
+// Requests the speech input service to cancel speech recognition on behalf of
+// the given |render_view_id|. If speech recognition is not happening or
+// is happening on behalf of some other render view, this call does nothing.
+IPC_MESSAGE_CONTROL2(SpeechInputHostMsg_CancelRecognition,
+                     int /* render_view_id */,
+                     int /* request_id */)
+
+// Requests the speech input service to stop audio recording on behalf of
+// the given |render_view_id|. Any audio recorded so far will be fed to the
+// speech recognizer. If speech recognition is not happening nor or is
+// happening on behalf of some other render view, this call does nothing.
+IPC_MESSAGE_CONTROL2(SpeechInputHostMsg_StopRecording,
+                     int /* render_view_id */,
+                     int /* request_id */)
+
+// Speech input messages sent from the browser to the renderer.
+
+// Relay a speech recognition result, either partial or final.
+IPC_MESSAGE_ROUTED2(SpeechInputMsg_SetRecognitionResult,
+                    int /* request_id */,
+                    speech_input::SpeechInputResultArray /* result */)
+
+// Indicate that speech recognizer has stopped recording and started
+// recognition.
+IPC_MESSAGE_ROUTED1(SpeechInputMsg_RecordingComplete,
+                    int /* request_id */)
+
+// Indicate that speech recognizer has completed recognition. This will be
+// the last message sent in response to a
+// ViewHostMsg_SpeechInput_StartRecognition.
+IPC_MESSAGE_ROUTED1(SpeechInputMsg_RecognitionComplete,
+                    int /* request_id */)
+
+#endif  // CHROME_COMMON_SPEECH_INPUT_MESSAGES_H_