Add a tray notification UI for speech input recording in the extension API.

chrome/browser/speech/speech_input_extension_notification.h

Index: chrome/browser/speech/speech_input_extension_notification.h
diff --git a/chrome/browser/speech/speech_input_extension_notification.h b/chrome/browser/speech/speech_input_extension_notification.h
new file mode 100644
index 0000000000000000000000000000000000000000..e6547d6499e20fb21f4d5a5d7f5b5fb4a784486d
--- /dev/null
+++ b/chrome/browser/speech/speech_input_extension_notification.h
@@ -0,0 +1,38 @@
+// 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_BROWSER_SPEECH_SPEECH_INPUT_EXTENSION_NOTIFICATION_H_
+#define CHROME_BROWSER_SPEECH_SPEECH_INPUT_EXTENSION_NOTIFICATION_H_
+#pragma once
+
+#include "base/memory/scoped_ptr.h"
+
+class Extension;
+class Profile;
+class SkBitmap;
+class SkCanvas;
+class StatusIcon;
+
+// Manages the notification UI shown when an extension starts recording audio
+// for speech recognition.
+class SpeechInputExtensionNotification {
+ public:
+  explicit SpeechInputExtensionNotification(Profile* profile);
+  virtual ~SpeechInputExtensionNotification();
+
+  void Show(const Extension* extension, bool show_balloon);
+  void Hide();
+  void SetVUMeterVolume(float volume);
+
+ private:
+  void DrawVolume(SkCanvas* canvas, const SkBitmap& bitmap, float volume);
+  void ShowNotificationBalloon(const Extension* extension);
+
+  Profile* profile_;
+  scoped_ptr<SkBitmap> mic_image_;
+  scoped_ptr<SkBitmap> buffer_image_;
+  StatusIcon* tray_icon_;
+};
+
+#endif  // CHROME_BROWSER_SPEECH_SPEECH_INPUT_EXTENSION_NOTIFICATION_H_