Revert of Stop caching supported codecs in WebRtcVideoEngine2

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 87 matching lines @@
   WebRtcVideoEngine2();
   virtual ~WebRtcVideoEngine2();
 
   // Basic video engine implementation.
   void Init();
 
   WebRtcVideoChannel2* CreateChannel(webrtc::Call* call,
                                      const MediaConfig& config,
                                      const VideoOptions& options);
 
-  const std::vector<VideoCodec> codecs() const;
+  const std::vector<VideoCodec>& codecs() const;
   RtpCapabilities GetCapabilities() const;
 
   // Set a WebRtcVideoDecoderFactory for external decoding. Video engine does
   // not take the ownership of |decoder_factory|. The caller needs to make sure
   // that |decoder_factory| outlives the video engine.
   void SetExternalDecoderFactory(WebRtcVideoDecoderFactory* decoder_factory);
   // Set a WebRtcVideoEncoderFactory for external encoding. Video engine does
   // not take the ownership of |encoder_factory|. The caller needs to make sure
   // that |encoder_factory| outlives the video engine.
   virtual void SetExternalEncoderFactory(
       WebRtcVideoEncoderFactory* encoder_factory);
 
  private:
+  std::vector<VideoCodec> video_codecs_;
+
   bool initialized_;
 
   WebRtcVideoDecoderFactory* external_decoder_factory_;
   WebRtcVideoEncoderFactory* external_encoder_factory_;
   std::unique_ptr<WebRtcVideoEncoderFactory> simulcast_encoder_factory_;
 };
 
 class WebRtcVideoChannel2 : public VideoMediaChannel, public webrtc::Transport {
  public:
   WebRtcVideoChannel2(webrtc::Call* call,
@@ skipping 387 matching lines @@
   VideoSendParameters send_params_;
   VideoOptions default_send_options_;
   VideoRecvParameters recv_params_;
   bool red_disabled_by_remote_side_;
   int64_t last_stats_log_ms_;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_ENGINE_WEBRTCVIDEOENGINE2_H_