Add support for iOS application bundle to GN.

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 = ""
+  xcode_version = ""
+  xcode_build = ""
+  machine_os_build = ""
 
   use_ios_simulator = target_cpu == "x86" || target_cpu == "x64"
 
   # Version of iOS that we're targeting.
   ios_deployment_target = "7.0"
 
   # 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 = ""
 }
 
 if (ios_sdk_path == "") {
   # Compute default target.
   if (use_ios_simulator) {
-    _ios_sdk_to_query = "iphonesimulator"
+    ios_sdk_name = "iphonesimulator"
+    ios_sdk_platform = "iPhoneSimulator"
   } else {
-    _ios_sdk_to_query = "iphoneos"
+    ios_sdk_name = "iphoneos"
+    ios_sdk_platform = "iPhoneOS"
   }
-  _ios_sdk_result =
-      exec_script("ios_sdk.py", [ _ios_sdk_to_query ], "list lines")
-  ios_sdk_path = _ios_sdk_result[0]
+  _ios_sdk_result = exec_script("ios_sdk.py", [ ios_sdk_name ], "scope")
+  ios_sdk_path = _ios_sdk_result.ios_sdk_path
+  ios_sdk_version = _ios_sdk_result.ios_sdk_version
+  xcode_version = _ios_sdk_result.xcode_version
+  xcode_build = _ios_sdk_result.xcode_build
+  machine_os_build = _ios_sdk_result.machine_os_build
 }
 
 if (use_ios_simulator) {
   # Always disable code signing on the simulator
   ios_enable_code_signing = false
   ios_code_signing_identity = ""
 }
 
 if (ios_enable_code_signing) {
   # If an identity is not provided, look for one on the host
   if (ios_code_signing_identity == "") {
     _ios_identities = exec_script("find_signing_identity.py", [], "list 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 dont require code signing...")
     assert(false)
   }
 }