add ScalePlane_16 unit tests

Tests ScalePlane vs ScalePlane_16 match.

Bug: libyuv:749
Test: LibYUVScaleTest.ScalePlaneDownBy4_Box_16
Change-Id: I3f71748da404982d5d48bfb11bbd3ae95a1d021c
Reviewed-on: https://chromium-review.googlesource.com/765045Reviewed-by: Frank Barchard <fbarchard@google.com>
Reviewed-by: richard winterton <rrwinterton@gmail.com>
Reviewed-by: Weiyong Yao <braveyao@chromium.org>

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 1676
+Version: 1677
 License: BSD
 License File: LICENSE
 

include/libyuv/row.h

@@ -1537,10 +1537,7 @@ void MultiplyRow_16_AVX2(const uint16* src_y,
                          uint16* dst_y,
                          int scale,
                          int width);
-void MultiplyRow_16_C(const uint16* src_y,
-                      uint16* dst_y,
-                      int scale,
-                      int width);
+void MultiplyRow_16_C(const uint16* src_y, uint16* dst_y, int scale, int width);
 
 void CopyRow_SSE2(const uint8* src, uint8* dst, int count);
 void CopyRow_AVX(const uint8* src, uint8* dst, int count);

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 1676
+#define LIBYUV_VERSION 1677
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_

source/row_gcc.cc

@@ -2800,7 +2800,6 @@ void MergeUVRow_16_AVX2(const uint16* src_u,
 }
 #endif  // HAS_MERGEUVROW_AVX2
 
-
 #ifdef HAS_MULTIPLYROW_16_AVX2
 void MultiplyRow_16_AVX2(const uint16* src_y,
                          uint16* dst_y,