Move usage of QualityScaler to ViEEncoder.

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 880f45fa7e4ca7f0ffa55ccd67251e3e5f986eec..a72ece8a0c9689ef3dc7a58608cc37d706e19f1d 100644
--- a/webrtc/modules/video_coding/codecs/vp8/simulcast_encoder_adapter.cc
+++ b/webrtc/modules/video_coding/codecs/vp8/simulcast_encoder_adapter.cc
@@ -469,6 +469,16 @@ bool SimulcastEncoderAdapter::SupportsNativeHandle() const {
   return true;
 }
 
+VideoEncoder::ScalingSettings SimulcastEncoderAdapter::GetScalingSettings()
+    const {
+  // Turn off quality scaling for simulcast.
+  if (NumberOfStreams(codec_) == 1) {
+    return streaminfos_[0].encoder->GetScalingSettings();
+  } else {
+    return VideoEncoder::ScalingSettings(false);
+  }
+}
+
 const char* SimulcastEncoderAdapter::ImplementationName() const {
   return implementation_name_.c_str();
 }