Recreate WebrtcVideoSendStream if screen content setting is changed.

webrtc/media/engine/webrtcvideoengine2.h

 /*
  *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 288 matching lines @@
                        const cricket::VideoCodec& codec,
                        bool external);
       webrtc::VideoEncoder* encoder;
       webrtc::VideoEncoder* external_encoder;
       cricket::VideoCodec codec;
       bool external;
     };
 
     rtc::scoped_refptr<webrtc::VideoEncoderConfig::EncoderSpecificSettings>
     ConfigureVideoEncoderSettings(const VideoCodec& codec);
-    AllocatedEncoder CreateVideoEncoder(const VideoCodec& codec);
+    // If force_encoder_allocation is true, a new AllocatedEncoder is always
+    // created. If false, the allocated encoder may be reused, if the type
+    // matches.
+    AllocatedEncoder CreateVideoEncoder(const VideoCodec& codec,
+                                        bool force_encoder_allocation);
     void DestroyVideoEncoder(AllocatedEncoder* encoder);
-    void SetCodec(const VideoCodecSettings& codec);
+    void SetCodec(const VideoCodecSettings& codec,
+                  bool force_encoder_allocation);
     void RecreateWebRtcStream();
     webrtc::VideoEncoderConfig CreateVideoEncoderConfig(
         const VideoCodec& codec) const;
     void ReconfigureEncoder();
     bool ValidateRtpParameters(const webrtc::RtpParameters& parameters);
 
     // Calls Start or Stop according to whether or not |sending_| is true,
     // and whether or not the encoding in |rtp_parameters_| is active.
     void UpdateSendState();
 
@@ skipping 168 matching lines @@
   // send_params/recv_params, rtp_extensions, options, etc.
   VideoSendParameters send_params_;
   VideoOptions default_send_options_;
   VideoRecvParameters recv_params_;
   int64_t last_stats_log_ms_;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_ENGINE_WEBRTCVIDEOENGINE2_H_