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

webrtc/video/video_send_stream_tests.cc

Index: webrtc/video/video_send_stream_tests.cc
diff --git a/webrtc/video/video_send_stream_tests.cc b/webrtc/video/video_send_stream_tests.cc
index d138893ba4cc293155b8daa7595c0f3eb715ef61..34f14ba491728fe0b333f6112445a3d65ab1f9b2 100644
--- a/webrtc/video/video_send_stream_tests.cc
+++ b/webrtc/video/video_send_stream_tests.cc
@@ -2017,10 +2017,12 @@ void VideoCodecConfigObserver<VideoCodecVP8>::VerifyCodecSpecifics(
   }
 
   // Set expected temporal layers as they should have been set when
-  // reconfiguring the encoder and not match the set config.
+  // reconfiguring the encoder and not match the set config. Also copy the
+  // TemporalLayersFactory pointer that has been injected by ViEEncoder.
   VideoCodecVP8 encoder_settings = encoder_settings_;
   encoder_settings.numberOfTemporalLayers =
       kVideoCodecConfigObserverNumberOfTemporalLayers;
+  encoder_settings.tl_factory = config.codecSpecific.VP8.tl_factory;
   EXPECT_EQ(0, memcmp(&config.codecSpecific.VP8, &encoder_settings,
                       sizeof(encoder_settings_)));
 }