libyuv::YUY2ToY for isolating Y channel of YUY2.

unit_test/convert_test.cc

Index: unit_test/convert_test.cc
diff --git a/unit_test/convert_test.cc b/unit_test/convert_test.cc
index 7542ddf44e236ae6a7cf83f0f490e16f93a5cb13..44c8fa1d8b1e6d02d47dc6671db0624b913331ed 100644
--- a/unit_test/convert_test.cc
+++ b/unit_test/convert_test.cc
@@ -315,8 +315,6 @@ TEST_F(LibYUVConvertTest, SRC_FMT_PLANAR##To##FMT_PLANAR##_##PN##N) {\
 TESTAPLANARTOP(Android420, I420, 1, 0, 0, 2, 2, I420, 2, 2)
 TESTAPLANARTOP(Android420, NV12, 2, 0, 1, 2, 2, I420, 2, 2)
 TESTAPLANARTOP(Android420, NV21, 2, 1, 0, 2, 2, I420, 2, 2)
-// YUV3 causes msan failure.  skip for now.
-//TESTAPLANARTOP(Android420, YUV3, 3, 0, 1, 2, 2, I420, 2, 2)
 
 #define TESTPLANARTOBPI(SRC_FMT_PLANAR, SRC_SUBSAMP_X, SRC_SUBSAMP_Y,          \
                        FMT_PLANAR, SUBSAMP_X, SUBSAMP_Y, W1280, N, NEG, OFF)   \
@@ -1139,6 +1137,7 @@ TESTATOB(ARGB1555, 2, 2, 1, ARGB, 4, 4, 1, 0)
 TESTATOB(ARGB4444, 2, 2, 1, ARGB, 4, 4, 1, 0)
 TESTATOB(YUY2, 2, 4, 1, ARGB, 4, 4, 1, 4)
 TESTATOB(UYVY, 2, 4, 1, ARGB, 4, 4, 1, 4)
+TESTATOB(YUY2, 2, 4, 1, Y, 1, 1, 1, 0)
 TESTATOB(I400, 1, 1, 1, ARGB, 4, 4, 1, 0)
 TESTATOB(J400, 1, 1, 1, ARGB, 4, 4, 1, 0)
 TESTATOB(I400, 1, 1, 1, I400, 1, 1, 1, 0)