Begin adding support for tab mirroring via the MediaStream audio/video capturing

content/browser/renderer_host/media/media_stream_requester.h

 // 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_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_REQUESTER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_REQUESTER_H_
 
 #include <string>
 
 #include "content/common/content_export.h"
 #include "content/common/media/media_stream_options.h"
 
 namespace media_stream {
 
 // MediaStreamRequester must be implemented by the class requesting a new media
 // stream to be opened. MediaStreamManager will use this interface to signal
 // success and error for a request.
 class CONTENT_EXPORT MediaStreamRequester {
  public:
-  // Called as a reply of a successful call to GenerateStream.
+  // Called as a reply of a successful call to GenerateStream or
+  // GenerateStreamForDevice.
   virtual void StreamGenerated(const std::string& label,
                                const StreamDeviceInfoArray& audio_devices,
                                const StreamDeviceInfoArray& video_devices) = 0;
   // Called if GenerateStream failed.
   virtual void StreamGenerationFailed(const std::string& label) = 0;
   // AudioDeviceFailed is called if an already opened audio device encounters
   // an error.
   virtual void AudioDeviceFailed(const std::string& label, int index) = 0;
   // VideoDeviceFailed is called if an already opened video device encounters
   // an error.
   virtual void VideoDeviceFailed(const std::string& label, int index) = 0;
 
   // Called as a reply of a successful call to EnumerateDevices.
   virtual void DevicesEnumerated(const std::string& label,
                                  const StreamDeviceInfoArray& devices) = 0;
   // Called as a reply of a successful call to OpenDevice.
   virtual void DeviceOpened(const std::string& label,
                             const StreamDeviceInfo& device_info) = 0;
 
  protected:
   virtual ~MediaStreamRequester() {
   }
 };
 
 }  // namespace media_stream
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_REQUESTER_H_