Add variables to simplify code signing on iOS.

build/config/ios/ios_sdk.gni

 # Copyright 2015 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.
 
 declare_args() {
   # SDK path to use. When empty this will use the default SDK based on the
   # value of use_ios_simulator.
   ios_sdk_path = ""
   ios_sdk_name = ""
   ios_sdk_version = ""
   ios_sdk_platform = ""
   ios_sdk_platform_path = ""
   xcode_version = ""
   xcode_build = ""
   machine_os_build = ""
 
   use_ios_simulator = current_cpu == "x86" || current_cpu == "x64"
 
   # Version of iOS that we're targeting.
   ios_deployment_target = "9.0"
 
   # The iOS Code signing identity to use
   # TODO(GYP), TODO(sdfresne): Consider having a separate
   # ios_enable_code_signing_flag=<bool> flag to make the invocation clearer.
   ios_enable_code_signing = true
   ios_code_signing_identity = ""
 
+  # Prefix for CFBundleIdentifier property of iOS bundles (correspond to the
+  # "Organization Identifier" in Xcode). Code signing will fail if no mobile
+  # provisioning for the selected code signing identify support that prefix.
+  ios_app_bundle_id_prefix = "org.chromium"
+
+  # If true, then allow using Xcode to automatically manage certificates. This
+  # requires loading a separate Xcode project and enable automatically managed
+  # certificates. When true, all test application will use the same bundle id
+  # to avoid running out of certificates if using a free account.
+  ios_automatically_manage_certs = true
+
   # If non-empty, this list must contain valid cpu architecture, and the final
   # build will be a multi-architecture build (aka fat build) supporting the
   # main $target_cpu architecture and all of $additional_target_cpus.
   #
   # For example to build an application that will run on both arm64 and armv7
   # devices, you would use the following in args.gn file when running "gn args":
   #
   #   target_os = "ios"
   #   target_cpu = "arm64"
   #   additional_target_cpus = [ "arm" ]
@@ skipping 59 matching lines @@
     ios_code_signing_identity = _ios_identities[0]
   }
 
   if (ios_code_signing_identity == "") {
     print("Tried to prepare a device build without specifying a code signing")
     print("identity and could not detect one automatically either.")
     print("TIP: Simulator builds don't require code signing...")
     assert(false)
   }
 }