Work on GN iOS build.

build/gyp_chromium

 #!/usr/bin/env python
 
 # Copyright (c) 2012 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.
 
 # This script is wrapper for Chromium that adds some support for how GYP
 # is invoked by Chromium beyond what can be done in the gclient hooks.
 
 import glob
@@ skipping 205 matching lines @@
       ('asan', '1', 'is_asan=true'),
       ('lsan', '1', 'is_lsan=true'),
       ('msan', '1', 'is_msan=true'),
       ('tsan', '1', 'is_tsan=true'),
   ]
   for i in remap_cases:
     if i[0] in vars_dict and vars_dict[i[0]] == i[1]:
       gn_args += ' ' + i[2]
 
   # These string arguments get passed directly as GN strings.
-  for v in ['android_src', 'windows_sdk_path', 'arm_float_abi']:
+  for v in ['android_src', 'arm_float_abi', 'ios_deployment_target',
+            'ios_sdk_path', 'windows_sdk_path']:
     if v in vars_dict:
       gn_args += ' ' + v + '=' + EscapeStringForGN(vars_dict[v])
 
   # gomadir is renamed goma_dir in the GN build.
   if 'gomadir' in vars_dict:
     gn_args += ' goma_dir=%s' % EscapeStringForGN(vars_dict['gomadir'])
 
+  # Clear the "use_ios_simulator" flag if the ios_sdk_path is set and is
+  # not a simulator SDK. This duplicates code done in GYP's xcode emulation.
+  if 'ios_sdk_path' in vars_dict:
+    if not os.path.basename(vars_dict['ios_sdk_path']).lower().startswith(
+        'iphonesimulator'):
+      gn_args += ' use_ios_simulator=false'
+
+
   # These arguments get passed directly as integers (avoiding the quoting and
   # escaping of the string ones above).
   for v in ['arm_version']:
     if v in vars_dict:
       gn_args += ' %s=%s' % (v, vars_dict[v])
 
   # Some other flags come from GYP environment variables.
   gyp_msvs_version = os.environ.get('GYP_MSVS_VERSION', '')
   if gyp_msvs_version:
     gn_args += ' visual_studio_version=' + EscapeStringForGN(gyp_msvs_version)
@@ skipping 184 matching lines @@
   args.extend(
       ['-I' + i for i in additional_include_files(supplemental_includes, args)])
 
   args.extend(['-D', 'gyp_output_dir=' + GetOutputDirectory()])
 
   print 'Updating projects from gyp files...'
   sys.stdout.flush()
 
   # Off we go...
   sys.exit(gyp.main(args))