Don't re-randomize picture_id/tl0_pic_idx when re-initializing internal encoders.

webrtc/modules/video_coding/codecs/vp8/default_temporal_layers.h

 /* Copyright (c) 2013 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.
 */
 /*
 * This file defines classes for doing temporal layers with VP8.
@@ skipping 28 matching lines @@
   bool UpdateConfiguration(vpx_codec_enc_cfg_t* cfg) override;
 
   void PopulateCodecSpecific(bool frame_is_keyframe,
                              CodecSpecificInfoVP8* vp8_info,
                              uint32_t timestamp) override;
 
   void FrameEncoded(unsigned int size, int qp) override {}
 
   int CurrentLayerId() const override;
 
+  uint8_t Tl0PicIdx() const override;
+
  private:
   const size_t num_layers_;
   const std::vector<unsigned int> temporal_ids_;
   const std::vector<TemporalReferences> temporal_pattern_;
 
   uint8_t tl0_pic_idx_;
   uint8_t pattern_idx_;
   uint32_t timestamp_;
   bool last_base_layer_sync_;
   rtc::Optional<std::vector<uint32_t>> new_bitrates_kbps_;
 };
 
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_DEFAULT_TEMPORAL_LAYERS_H_