Implement MediaCaptureDevices.

content/public/browser/media_capture_devices.h

+// Copyright 2014 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_PUBLIC_BROWSER_MEDIA_CAPTURE_DEVICES_H_
+#define CONTENT_PUBLIC_BROWSER_MEDIA_CAPTURE_DEVICES_H_
+
+#include "content/public/common/media_stream_request.h"
+
+namespace content {
+
+// This is a singleton class, used to get Audio/Video devices, it also provides
+// observer interface to notify the change of devices.

[jam, 2014/03/06 01:40:38]

nit: remove the second part of this comment

[michaelbai, 2014/03/06 05:24:52]

Done.

+CONTENT_EXPORT class MediaCaptureDevices {
+ public:
+  // Get signleton instance of MediaCaptureDevices.
+  static MediaCaptureDevices* GetInstance();
+
+  // Return all Audio/Video devices.
+  virtual const MediaStreamDevices& GetAudioCaptureDevices() = 0;
+  virtual const MediaStreamDevices& GetVideoCaptureDevices() = 0;
+

[jam, 2014/03/06 01:40:38]

let's move the one method from content/public/browser/media_devices_monitor.h
here and remove that file

[michaelbai, 2014/03/06 05:24:52]

The head file was removed, and the method is in media_capture_devices_impl.cc
now.

On 2014/03/06 01:40:38, jam wrote:

+ private:
+  // This interface should only be implemented inside content.
+  friend class MediaCaptureDevicesImpl;
+  MediaCaptureDevices() {}
+  virtual ~MediaCaptureDevices() {}
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_MEDIA_CAPTURE_DEVICES_H_