Add build flag to enable bitcode on ios

webrtc/build/webrtc.gni

 # Copyright (c) 2014 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.
 
 import("//build/config/arm.gni")
 import("//build/config/features.gni")
@@ skipping 154 matching lines @@
 # We need absolute paths for all configs in templates as they are shared in
 # different subdirectories.
 webrtc_root = get_path_info("../", "abspath")
 
 # Global configuration that should be applied to all WebRTC targets.
 # You normally shouldn't need to include this in your target as it's
 # automatically included when using the rtc_* templates.
 # It sets defines, include paths and compilation warnings accordingly,
 # both for WebRTC stand-alone builds and for the scenario when WebRTC
 # native code is built as part of Chromium.
-rtc_common_config = webrtc_root + ":common_config"
+rtc_common_configs = [ webrtc_root + ":common_config" ]
 
 # Global public configuration that should be applied to all WebRTC targets. You
 # normally shouldn't need to include this in your target as it's automatically
 # included when using the rtc_* templates. It set the defines, include paths and
 # compilation warnings that should be propagated to dependents of the targets
 # depending on the target having this config.
 rtc_common_inherited_config = webrtc_root + ":common_inherited_config"
 
+if (is_ios) {
+  rtc_common_configs += [ webrtc_root + "/build/ios:rtc_ios_common_config" ]
+}
+
 # Common configs to remove or add in all rtc targets.
 rtc_remove_configs = []
-rtc_add_configs = [ rtc_common_config ]
+rtc_add_configs = rtc_common_configs
 
 set_defaults("rtc_test") {
   configs = rtc_add_configs
   suppressed_configs = []
 }
 
 set_defaults("rtc_source_set") {
   configs = rtc_add_configs
   suppressed_configs = []
 }
@@ skipping 105 matching lines @@
                            ])
     configs += invoker.configs
     configs -= rtc_remove_configs
     configs -= invoker.suppressed_configs
     public_configs = [ rtc_common_inherited_config ]
     if (defined(invoker.public_configs)) {
       public_configs += invoker.public_configs
     }
   }
 }