Default iOS builds to our code signing identity.

gyp/common_conditions.gypi

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # conditions used in both common.gypi and skia.gyp in chromium
 #
 {
   'defines': [
     'SK_ALLOW_STATIC_GLOBAL_INITIALIZERS=<(skia_static_initializers)',
@@ skipping 528 matching lines @@
           'Release': {
             'xcode_settings': {
               'GCC_OPTIMIZATION_LEVEL': '<(skia_release_optimization_level)',
             },
             'defines': [ 'NDEBUG' ],
           },
         },
         'xcode_settings': {
           'ARCHS': ['armv7'],
           'CODE_SIGNING_REQUIRED': 'NO',
-          'CODE_SIGN_IDENTITY[sdk=iphoneos*]': '',
+          'CODE_SIGN_IDENTITY[sdk=iphoneos*]': 'iPhone Developer: Google Development (3F4Y5873JF)',
           'IPHONEOS_DEPLOYMENT_TARGET': '<(ios_sdk_version)',
           'SDKROOT': 'iphoneos',
           'TARGETED_DEVICE_FAMILY': '1,2',
           'GCC_WARN_ABOUT_INVALID_OFFSETOF_MACRO': 'NO',   # -Wno-invalid-offsetof
           'OTHER_CPLUSPLUSFLAGS': [
             '-std=c++0x',
             '-fvisibility=hidden',
             '-fvisibility-inlines-hidden',
           ],
           'GCC_THUMB_SUPPORT': 'NO',
@@ skipping 60 matching lines @@
         # add flags here (e.g. SK_SUPPORT_LEGACY_...) needed by moz2d
       ],
     }],
 
   ], # end 'conditions'
   # The Xcode SYMROOT must be at the root. See build/common.gypi in chromium for more details
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }