respect subsample in planar unittest
BUG=289
TESTED=drmemory on YUY2ToI420_Opt with odd width
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/4709004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@881 16f28f9a-4ce2-e073-06de-1de4eb20be90
diff --git a/unit_test/convert_test.cc b/unit_test/convert_test.cc
index 5e0ea2a..0e5fab3 100644
--- a/unit_test/convert_test.cc
+++ b/unit_test/convert_test.cc
@@ -579,7 +579,8 @@
 TEST_F(libyuvTest, FMT_A##To##FMT_PLANAR##N) {                                 \

   const int kWidth = ((W1280) > 0) ? (W1280) : 1;                              \

   const int kHeight = ALIGNINT(benchmark_height_, YALIGN);                     \

-  const int kStride = (kWidth * 8 * BPP_A + 7) / 8;                            \

+  const int kStride =                                                          \

+      (SUBSAMPLE(kWidth, SUBSAMP_X) * SUBSAMP_X * 8 * BPP_A + 7) / 8;          \

   align_buffer_64(src_argb, kStride * kHeight + OFF);                          \

   align_buffer_64(dst_y_c, kWidth * kHeight);                                  \

   align_buffer_64(dst_u_c,                                                     \