Extract bitrate allocation of spatial/temporal layers out of codec impl.

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

Index: webrtc/modules/video_coding/codecs/vp8/simulcast_encoder_adapter.h
diff --git a/webrtc/modules/video_coding/codecs/vp8/simulcast_encoder_adapter.h b/webrtc/modules/video_coding/codecs/vp8/simulcast_encoder_adapter.h
index 30d5abb6cc81fe4fcac53613347d60202f5d8def..07d93bae996915f594fd488f5fdd626457b375ba 100644
--- a/webrtc/modules/video_coding/codecs/vp8/simulcast_encoder_adapter.h
+++ b/webrtc/modules/video_coding/codecs/vp8/simulcast_encoder_adapter.h
@@ -49,6 +49,8 @@ class SimulcastEncoderAdapter : public VP8Encoder {
   int RegisterEncodeCompleteCallback(EncodedImageCallback* callback) override;
   int SetChannelParameters(uint32_t packet_loss, int64_t rtt) override;
   int SetRates(uint32_t new_bitrate_kbit, uint32_t new_framerate) override;
+  int SetRateAllocation(const BitrateAllocation& bitrate,
+                        uint32_t new_framerate) override;
 
   // Eventual handler for the contained encoders' EncodedImageCallbacks, but
   // called from an internal helper that also knows the correct stream
@@ -103,12 +105,11 @@ class SimulcastEncoderAdapter : public VP8Encoder {
   bool Initialized() const;
 
   std::unique_ptr<VideoEncoderFactory> factory_;
-  std::unique_ptr<TemporalLayersFactory> screensharing_tl_factory_;
   VideoCodec codec_;
   std::vector<StreamInfo> streaminfos_;
   EncodedImageCallback* encoded_complete_callback_;
   std::string implementation_name_;
-  std::unique_ptr<SimulcastRateAllocator> rate_allocator_;
+  std::unique_ptr<SimulcastRateAllocator> fallback_rate_allocator_;
 };
 
 }  // namespace webrtc