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

webrtc/supplement.gypi

 {
   'variables': {
     'variables': {
       'webrtc_root%': '<(DEPTH)/webrtc',
       # Override the default (10.6) in Chromium's build/common.gypi.
       # Needed for ARC and libc++.
       'mac_deployment_target%': '10.7',
       # Disable use of sysroot for Linux. It's enabled by default in Chromium,
       # but it currently lacks the libudev-dev package.
       # TODO(kjellander): Remove when crbug.com/561584 is fixed.
       'use_sysroot': 0,
     },
     'webrtc_root%': '<(webrtc_root)',
     'mac_deployment_target%': '<(mac_deployment_target)',
     'use_sysroot%': '<(use_sysroot)',
     'build_with_chromium': 0,
+
+    # iLBC isn't included by default, but in standalone WebRTC we want it
+    # for testing.
+    'include_ilbc': 1,

[kjellander_webrtc, 2016/01/12 16:23:27]

ah, I missed this. Please make this (note the %):
'include_ilbc%': 1,

so it is possible to override it, even for the standalone build.
Please also test that it works to disable for the standalone build by:
webrtc/build/gyp_webrtc -Dinclude_iblc=0

Same for GN: please verify it's possible to turn it off with:
gn gen out/Default --args=rtc_include_ilbc=false

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

This typo cost me at least half an hour. I couldn't figure out why setting the
variable had no effect... :-)
Patch set #3 should address all your concerns. Among other things, it no longer
modifies supplement.gypi at all.

+
     'conditions': [
       ['OS=="ios"', {
         # Default to using BoringSSL on iOS.
         'use_openssl%': 1,
 
         # Set target_subarch for if not already set. This is needed because the
         # Chromium iOS toolchain relies on target_subarch being set.
         'conditions': [
           ['target_arch=="arm" or target_arch=="ia32"', {
             'target_subarch%': 'arm32',
@@ skipping 25 matching lines @@
             ],
             'sources': [
               '<(webrtc_root)/build/sanitizers/tsan_suppressions_webrtc.cc',
             ],
           }],
         ],
       }],
     ],
   },
 }