Add a gyp/gn variable for whether to use iLBC or not

webrtc/build/common.gypi

 # Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 # This file contains common settings for building WebRTC components.
 
@@ skipping 22 matching lines @@
       },
       'build_with_chromium%': '<(build_with_chromium)',
       'webrtc_root%': '<(webrtc_root)',
       'apk_tests_path%': '<(apk_tests_path)',
       'modules_java_gyp_path%': '<(modules_java_gyp_path)',
       'webrtc_vp8_dir%': '<(webrtc_root)/modules/video_coding/codecs/vp8',
       'webrtc_vp9_dir%': '<(webrtc_root)/modules/video_coding/codecs/vp9',
       'include_opus%': 1,
       'opus_dir%': '<(DEPTH)/third_party/opus',
 
+      # Include the iLBC audio codec?
+      'include_ilbc%': 0,

[hlundin-webrtc, 2016/01/12 16:15:41]

I'm not sure we want this to be default off. This does change the behavior for
non-chrome non-firefox integrations of WebRTC. We should probably announce that,
at the very least.

[kwiberg-webrtc, 2016/01/14 10:59:31]

I changed it to the same default as before. See patch set #3.

+
       # Enable to use the Mozilla internal settings.
       'build_with_mozilla%': 0,
     },
     'build_with_chromium%': '<(build_with_chromium)',
     'build_with_mozilla%': '<(build_with_mozilla)',
     'webrtc_root%': '<(webrtc_root)',
     'apk_tests_path%': '<(apk_tests_path)',
     'modules_java_gyp_path%': '<(modules_java_gyp_path)',
     'webrtc_vp8_dir%': '<(webrtc_vp8_dir)',
     'webrtc_vp9_dir%': '<(webrtc_vp9_dir)',
+    'include_ilbc%': '<(include_ilbc)',
     'include_opus%': '<(include_opus)',
     'rtc_relative_path%': 1,
     'external_libraries%': '0',
     'json_root%': '<(DEPTH)/third_party/jsoncpp/source/include/',
     # openssl needs to be defined or gyp will complain. Is is only used when
     # when providing external libraries so just use current directory as a
     # placeholder.
     'ssl_root%': '.',
 
     # The Chromium common.gypi we use treats all gyp files without
@@ skipping 387 matching lines @@
           # of a more specific macro.
           'defines': [
             'WEBRTC_POSIX',
           ],
         }],
       ],
     },
   }, # target_defaults
 }