Do not use assembly implementations of YUV conversions in MSan builds.

media/base/simd/convert_rgb_to_yuv_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/cpu.h"
 #include "base/memory/scoped_ptr.h"
 #include "media/base/simd/convert_rgb_to_yuv.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
@@ skipping 12 matching lines @@
 }
 
 int ConvertRGBToV(const uint8* rgb, int size) {
   int v = -18 * rgb[0] - 94 * rgb[1] + 112 * rgb[2];
   v = ((v + 128) >> 8) + 128;
   return std::max(0, std::min(255, v));
 }
 
 }  // namespace
 
+// Assembly code confuses MemorySanitizer. Do not run it in MSan builds.
+#if defined(MEMORY_SANITIZER)
+#define MAYBE_SideBySideRGB DISABLED_SideBySideRGB
+#else
+#define MAYBE_SideBySideRGB SideBySideRGB
+#endif
+
 // A side-by-side test that verifies our ASM functions that convert RGB pixels
 // to YUV pixels can output the expected results. This test converts RGB pixels
 // to YUV pixels with our ASM functions (which use SSE, SSE2, SSE3, and SSSE3)
 // and compare the output YUV pixels with the ones calculated with out reference
 // functions implemented in C++.
-TEST(YUVConvertTest, SideBySideRGB) {
+TEST(YUVConvertTest, MAYBE_SideBySideRGB) {
   // We skip this test on PCs which does not support SSE3 because this test
   // needs it.
   base::CPU cpu;
   if (!cpu.has_ssse3())
     return;
 
   // This test checks a subset of all RGB values so this test does not take so
   // long time.
   const int kStep = 8;
   const int kWidth = 256 / kStep;
@@ skipping 49 matching lines @@
           const uint8* p = &rgb[i * 2 * size];
           int error = ConvertRGBToV(p, size) - v[i];
           total_error += error > 0 ? error : -error;
         }
       }
     }
 
     EXPECT_EQ(0, total_error);
   }
 }