Add unit test for stand-alone denoiser and fixed some bugs.

webrtc/modules/video_processing/frame_preprocessor.cc

 /*
  *  Copyright (c) 2012 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 77 matching lines @@
 
 uint32_t VPMFramePreprocessor::GetDecimatedWidth() const {
   return spatial_resampler_->TargetWidth();
 }
 
 uint32_t VPMFramePreprocessor::GetDecimatedHeight() const {
   return spatial_resampler_->TargetHeight();
 }
 
 void VPMFramePreprocessor::EnableDenosing(bool enable) {
-  denoiser_.reset(new VideoDenoiser());
+  denoiser_.reset(new VideoDenoiser(true));
 }
 
 const VideoFrame* VPMFramePreprocessor::PreprocessFrame(
     const VideoFrame& frame) {
   if (frame.IsZeroSize()) {
     return nullptr;
   }
 
   vd_->UpdateIncomingframe_rate();
   if (vd_->DropFrame()) {
@@ skipping 23 matching lines @@
   }
   ++frame_cnt_;
   return current_frame;
 }
 
 VideoContentMetrics* VPMFramePreprocessor::GetContentMetrics() const {
   return content_metrics_;
 }
 
 }  // namespace webrtc