Add support for iOS Frameworks with header maps.

test/ios/framework/framework.gyp

+# Copyright 2016 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.
+
+{
+  'targets': [
+    {
+      'target_name': 'iOSFramework',
+      'type': 'shared_library',
+      'mac_bundle': 1,
+      'sources': [
+        'iOSFramework/iOSFramework.h',
+      ],
+      'link_settings': {
+        'libraries': [
+          '$(SDKROOT)/System/Library/Frameworks/Foundation.framework',
+          '$(SDKROOT)/System/Library/Frameworks/UIKit.framework',
+        ],
+      },
+      'mac_framework_headers': [
+        'iOSFramework/iOSFramework.h',
+      ],
+      'mac_framework_dirs': [
+        '$(SDKROOT)/../../Library/Frameworks',
+      ],
+      'xcode_settings': {
+        'OTHER_CFLAGS': [
+          '-fobjc-abi-version=2',
+        ],
+        'INFOPLIST_FILE': 'iOSFramework/Info.plist',
+        'GCC_VERSION': 'com.apple.compilers.llvm.clang.1_0',
+        'SDKROOT': 'iphoneos',
+        'IPHONEOS_DEPLOYMENT_TARGET': '8.0',
+        'CONFIGURATION_BUILD_DIR':'build/Default',
+        'CODE_SIGN_IDENTITY[sdk=iphoneos*]': 'iPhone Developer',
+      },
+    },
+  ],
+}