Reland of Properly report number of quality downscales in stats.

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

Index: webrtc/modules/video_coding/codecs/vp8/simulcast_encoder_adapter.cc
diff --git a/webrtc/modules/video_coding/codecs/vp8/simulcast_encoder_adapter.cc b/webrtc/modules/video_coding/codecs/vp8/simulcast_encoder_adapter.cc
index 6026cb31d2b0c29972bcf897854755dfabd1396a..a296b56846f433b7f282d8a6f9d11b9c73c44a61 100644
--- a/webrtc/modules/video_coding/codecs/vp8/simulcast_encoder_adapter.cc
+++ b/webrtc/modules/video_coding/codecs/vp8/simulcast_encoder_adapter.cc
@@ -464,7 +464,7 @@ bool SimulcastEncoderAdapter::SupportsNativeHandle() const {
 VideoEncoder::ScalingSettings SimulcastEncoderAdapter::GetScalingSettings()
     const {
   // Turn off quality scaling for simulcast.
-  if (NumberOfStreams(codec_) != 1)
+  if (!Initialized() || NumberOfStreams(codec_) != 1)
     return VideoEncoder::ScalingSettings(false);
   return streaminfos_[0].encoder->GetScalingSettings();
 }