Re-add AC3/EAC3 audio demuxing support

build/common.gypi

 # 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 1455 matching lines @@
 
     # Relative path to icu.gyp from this file.
     'icu_gyp_path': '../third_party/icu/icu.gyp',
 
     # IPC fuzzer is disabled by default.
     'enable_ipc_fuzzer%': 0,
 
     # Force disable libstdc++ debug mode.
     'disable_glibcxx_debug%': 0,
 
+    # Set to 1 to enable AC3/EAC3 audio demuxing
+    'enable_ac3_eac3_audio_demuxing%': 0,
+
     # Set to 1 to compile with MSE support for MPEG2 TS
     'enable_mpeg2ts_stream_parser%': 0,
 
     # Support ChromeOS touchpad gestures with ozone.
     'use_evdev_gestures%': 0,
 
     # Default ozone platform (if no --ozone-platform flag).
     'ozone_platform%': "",
 
     # Ozone platforms to include in the build.
@@ skipping 316 matching lines @@
 
         # Copy it out one scope.
         'android_webview_build%': '<(android_webview_build)',
       }],  # OS=="android"
       ['embedded==1', {
         'use_system_fontconfig%': 0,
       }, {
         'use_system_fontconfig%': 1,
       }],
       ['chromecast==1', {
+        'enable_ac3_eac3_audio_demuxing%': 1,
         'enable_mpeg2ts_stream_parser%': 1,
         'ffmpeg_branding%': 'ChromeOS',
         'ozone_platform_ozonex%': 1,
         'use_playready%': 0,
         'conditions': [
           ['target_arch=="arm"', {
             'arm_arch%': '',
             'arm_tune%': 'cortex-a9',
             'arm_thumb%': 1,
             'video_hole%': 1,
@@ skipping 827 matching lines @@
       }],
       ['enable_webrtc==1', {
         'defines': ['ENABLE_WEBRTC=1'],
       }],
       ['proprietary_codecs==1', {
         'defines': ['USE_PROPRIETARY_CODECS'],
         'conditions': [
           ['enable_mpeg2ts_stream_parser==1', {
             'defines': ['ENABLE_MPEG2TS_STREAM_PARSER'],
           }],
+          ['enable_ac3_eac3_audio_demuxing==1', {
+            'defines': ['ENABLE_AC3_EAC3_AUDIO_DEMUXING'],
+          }],
         ],
       }],
       ['enable_viewport==1', {
         'defines': ['ENABLE_VIEWPORT'],
       }],
       ['enable_pepper_cdms==1', {
         'defines': ['ENABLE_PEPPER_CDMS'],
       }],
       ['enable_browser_cdms==1', {
         'defines': ['ENABLE_BROWSER_CDMS'],
@@ skipping 3263 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }