Fix an issue in external VNR when width or height not divisible by 16.

webrtc/modules/video_processing/test/brightness_detection_test.cc

Index: webrtc/modules/video_processing/test/brightness_detection_test.cc
diff --git a/webrtc/modules/video_processing/test/brightness_detection_test.cc b/webrtc/modules/video_processing/test/brightness_detection_test.cc
index abce518e5841f7faffc77692dec3183fb2ca0b46..409cf1ff1d9724281988d52e619a01f14872cb7d 100644
--- a/webrtc/modules/video_processing/test/brightness_detection_test.cc
+++ b/webrtc/modules/video_processing/test/brightness_detection_test.cc
@@ -21,7 +21,7 @@ namespace webrtc {
 #else
 #define MAYBE_BrightnessDetection BrightnessDetection
 #endif
-TEST_F(VideoProcessingTest, MAYBE_BrightnessDetection) {
+TEST_P(VideoProcessingTest, MAYBE_BrightnessDetection) {
   uint32_t frameNum = 0;
   int32_t brightnessWarning = 0;
   uint32_t warningCount = 0;