Display moving object detection result on Nexus for debugging.

Review URL: https://codereview.webrtc.org/1890183003

Cr-Commit-Position: refs/heads/master@{#12390}
diff --git a/webrtc/modules/video_processing/video_denoiser.cc b/webrtc/modules/video_processing/video_denoiser.cc
index 4eef6d6..eafb5fa 100644
--- a/webrtc/modules/video_processing/video_denoiser.cc
+++ b/webrtc/modules/video_processing/video_denoiser.cc
@@ -12,6 +12,8 @@
 #include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
 #include "webrtc/modules/video_processing/video_denoiser.h"
 
+namespace webrtc {
+
 #if DISPLAY  // Rectangle diagnostics
 static void CopyMem8x8(const uint8_t* src,
                        int src_stride,
@@ -66,8 +68,6 @@
 }
 #endif
 
-namespace webrtc {
-
 VideoDenoiser::VideoDenoiser(bool runtime_cpu_detection)
     : width_(0),
       height_(0),