Move usage of QualityScaler to ViEEncoder.

webrtc/media/engine/videoencodersoftwarefallbackwrapper.cc

 /*
  *  Copyright (c) 2016 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.
  */
 
@@ skipping 145 matching lines @@
     return fallback_encoder_->OnDroppedFrame();
   return encoder_->OnDroppedFrame();
 }
 
 bool VideoEncoderSoftwareFallbackWrapper::SupportsNativeHandle() const {
   if (fallback_encoder_)
     return fallback_encoder_->SupportsNativeHandle();
   return encoder_->SupportsNativeHandle();
 }
 
+VideoEncoder::ScalingSettings
+VideoEncoderSoftwareFallbackWrapper::GetScalingSettings() const {
+  return encoder_->GetScalingSettings();
+}
+
 }  // namespace webrtc