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

media/base/vector_math.h

 // 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.
 
 #ifndef MEDIA_BASE_VECTOR_MATH_H_
 #define MEDIA_BASE_VECTOR_MATH_H_
 
 #include "media/base/media_export.h"
 
 namespace media {
 namespace vector_math {
 
 // Required alignment for inputs and outputs to all vector math functions
 enum { kRequiredAlignment = 16 };
 
 // Multiply each element of |src| (up to |len|) by |scale| and add to |dest|.
 // |src| and |dest| must be aligned by kRequiredAlignment.
 MEDIA_EXPORT void FMAC(const float src[], float scale, int len, float dest[]);
 
+// Multiply each element of |src| by |scale| and store in |dest|.  |src| and
+// |dest| must be aligned by kRequiredAlignment.
+MEDIA_EXPORT void FMUL(const float src[], float scale, int len, float dest[]);
+
 }  // namespace vector_math
 }  // namespace media
 
 #endif  // MEDIA_BASE_VECTOR_MATH_H_