Add vector_math::FMUL. Replace audio_util::AdjustVolume.

media/base/vector_math_testing.h

Index: media/base/vector_math_testing.h
diff --git a/media/base/vector_math_testing.h b/media/base/vector_math_testing.h
index 503ca6a396adbc372484920c7fb069a74def657b..1fecf4f2ea31664b4ce91eb0a2e2346548f1fabc 100644
--- a/media/base/vector_math_testing.h
+++ b/media/base/vector_math_testing.h
@@ -11,13 +11,15 @@
 namespace media {
 namespace vector_math {
 
-// Optimized versions of FMAC() function exposed for testing.  See vector_math.h
-// for details.
+// Optimized versions exposed for testing.  See vector_math.h for details.
 MEDIA_EXPORT void FMAC_C(const float src[], float scale, int len, float dest[]);
+MEDIA_EXPORT void FMUL_C(const float src[], float scale, int len, float dest[]);
 
 #if defined(ARCH_CPU_X86_FAMILY)
 MEDIA_EXPORT void FMAC_SSE(const float src[], float scale, int len,
                            float dest[]);
+MEDIA_EXPORT void FMUL_SSE(const float src[], float scale, int len,
+                           float dest[]);
 #endif
 
 }  // namespace vector_math