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

media/audio/mac/audio_auhal_mac.cc

 // Copyright 2013 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 "media/audio/mac/audio_auhal_mac.h"
 
 #include <CoreServices/CoreServices.h>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
@@ skipping 160 matching lines @@
 
   AudioOutputUnitStop(audio_unit_);
 
   base::AutoLock auto_lock(source_lock_);
   source_ = NULL;
   stopped_ = true;
 }
 
 void AUHALStream::SetVolume(double volume) {
   volume_ = static_cast<float>(volume);
-
-  // TODO(crogers): set volume property
 }
 
 void AUHALStream::GetVolume(double* volume) {
   *volume = volume_;
 }
 
 // Pulls on our provider to get rendered audio stream.
 // Note to future hackers of this function: Do not add locks which can
 // be contended in the middle of stream processing here (starting and stopping
 // the stream are ok) because this is running on a real-time thread.
@@ skipping 51 matching lines @@
     if (!source_) {
       ZeroBufferList(io_data);
       return noErr;
     }
 
     // Supply the input data and render the output data.
     source_->OnMoreIOData(
         input_bus_.get(),
         output_bus_.get(),
         AudioBuffersState(0, hardware_pending_bytes));
+    output_bus_->Scale(volume_);
   }
 
   return noErr;
 }
 
 // AUHAL callback.
 OSStatus AUHALStream::InputProc(
     void* user_data,
     AudioUnitRenderActionFlags* flags,
     const AudioTimeStamp* output_time_stamp,
@@ skipping 256 matching lines @@
       0,
       &callback,
       sizeof(callback));
   if (result != noErr)
     return false;
 
   return true;
 }
 
 }  // namespace media