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

webrtc/modules/video_processing/video_denoiser.cc

Index: webrtc/modules/video_processing/video_denoiser.cc
diff --git a/webrtc/modules/video_processing/video_denoiser.cc b/webrtc/modules/video_processing/video_denoiser.cc
index 83bcf7f1cc105584000a7e81aa47230d15b2eb0d..f7c854cb9d1b25578ed70d7356df1a950c78b74f 100644
--- a/webrtc/modules/video_processing/video_denoiser.cc
+++ b/webrtc/modules/video_processing/video_denoiser.cc
@@ -13,10 +13,10 @@
 
 namespace webrtc {
 
-VideoDenoiser::VideoDenoiser()
+VideoDenoiser::VideoDenoiser(bool runtime_cpu_detection)
     : width_(0),
       height_(0),
-      filter_(DenoiserFilter::Create()) {}
+      filter_(DenoiserFilter::Create(runtime_cpu_detection)) {}
 
 void VideoDenoiser::TrailingReduction(int mb_rows,
                                       int mb_cols,
@@ -79,7 +79,7 @@ void VideoDenoiser::DenoiseFrame(const VideoFrame& frame,
   int mb_cols = width_ >> 4;
   int mb_rows = height_ >> 4;
   if (metrics_.get() == nullptr)
-    metrics_.reset(new DenoiseMetrics[mb_cols * mb_rows]);
+    metrics_.reset(new DenoiseMetrics[mb_cols * mb_rows]());

[stefan-webrtc, 2015/12/10 08:53:25]

Why was () added?

[jackychen, 2015/12/11 19:57:57]

To memset the buffer to 0 to pass msan checking, this only happen once, so the
speed will not be slow down. 

   // Denoise on Y plane.
   uint8_t* y_dst = denoised_frame->buffer(kYPlane);
   uint8_t* u_dst = denoised_frame->buffer(kUPlane);