Vp9: Enable denoiser by default.

webrtc/media/engine/webrtcvideoengine2.cc

 /*
  *  Copyright (c) 2014 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 391 matching lines @@
     webrtc::VideoCodecVP9 vp9_settings =
         webrtc::VideoEncoder::GetDefaultVp9Settings();
     if (is_screencast) {
       // TODO(asapersson): Set to 2 for now since there is a DCHECK in
       // VideoSendStream::ReconfigureVideoEncoder.
       vp9_settings.numberOfSpatialLayers = 2;
     } else {
       vp9_settings.numberOfSpatialLayers = GetDefaultVp9SpatialLayers();
     }
     // VP9 denoising is disabled by default.
-    vp9_settings.denoisingOn = codec_default_denoising ? false : denoising;
+    vp9_settings.denoisingOn = codec_default_denoising ? true : denoising;
     vp9_settings.frameDroppingOn = frame_dropping;
     return new rtc::RefCountedObject<
         webrtc::VideoEncoderConfig::Vp9EncoderSpecificSettings>(vp9_settings);
   }
   return nullptr;
 }
 
 DefaultUnsignalledSsrcHandler::DefaultUnsignalledSsrcHandler()
     : default_recv_ssrc_(0), default_sink_(NULL) {}
 
@@ skipping 2136 matching lines @@
         rtx_mapping[video_codecs[i].codec.id] !=
             ulpfec_config.red_payload_type) {
       video_codecs[i].rtx_payload_type = rtx_mapping[video_codecs[i].codec.id];
     }
   }
 
   return video_codecs;
 }
 
 }  // namespace cricket