Use FFT from FFMpeg for OSX

third_party/WebKit/Source/config.gni

 # Copyright 2014 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.
 
 import("//build/config/ui.gni")
 import("//third_party/WebKit/public/public_features.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
 }
@@ skipping 15 matching lines @@
 }
 
 # Whether Android build uses OpenMAX DL FFT. Currently supported only on
 # ARMv7+, ARM64, x86 or x64 without webview. Also enables WebAudio support.
 # Whether WebAudio is actually available depends on runtime settings and flags.
 use_openmax_dl_fft =
     is_android && (current_cpu == "x86" || current_cpu == "x64" ||
                    (current_cpu == "arm" && arm_version >= 7) ||
                    current_cpu == "arm64" || current_cpu == "mipsel")
 
-use_webaudio_ffmpeg = !is_mac && !is_android
+# This actually means if WebAudio should use the FFT from FFMpeg.
+# WebAudio always uses FFMpeg for decoding audio files.
+use_webaudio_ffmpeg = !is_android
 
 # Set this to true to enable use of concatenated impulse responses for the HRTF
 # panner in WebAudio.
 # TODO(brettw) do we need this or can we assume its always on?
 use_concatenated_impulse_responses = true
 
 # feature_defines_list ---------------------------------------------------------
 
 feature_defines_list = [
   "ENABLE_LAYOUT_UNIT_IN_INLINE_BOXES=0",
@@ skipping 22 matching lines @@
 
 if (use_default_render_theme) {
   # Mirrors the USE_DEFAULT_RENDER_THEME buildflag_header in WebKit/public.
   # If/when Blink can use buildflag headers, this should be removed in
   # preference to that.
   feature_defines_list += [ "WTF_USE_DEFAULT_RENDER_THEME=1" ]
 }
 if (blink_logging_always_on) {
   feature_defines_list += [ "LOG_DISABLED=0" ]
 }