Upstream string_util function.

ios/chrome/ios_chrome.gyp

 # Copyright 2014 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.
 
 {
   'variables': {
     'chromium_code': 1,
    },
   'targets': [
     {
@@ skipping 21 matching lines @@
         '../../components/components_strings.gyp:components_strings',
         '../../net/net.gyp:net',
         '../../skia/skia.gyp:skia',
         '../../third_party/google_toolbox_for_mac/google_toolbox_for_mac.gyp:google_toolbox_for_mac',
         '../../ui/base/ui_base.gyp:ui_base',
         '../../ui/gfx/gfx.gyp:gfx',
         '../../url/url.gyp:url_lib',
         '../provider/ios_provider_chrome.gyp:ios_provider_chrome_browser',
         '../web/ios_web.gyp:ios_web',
         'injected_js',
+        'ios_chrome_common',
         'ios_chrome_resources.gyp:ios_theme_resources_gen',
       ],
       'link_settings': {
         'libraries': [
           '$(SDKROOT)/System/Library/Frameworks/Accelerate.framework',
           '$(SDKROOT)/System/Library/Frameworks/CoreGraphics.framework',
           '$(SDKROOT)/System/Library/Frameworks/Foundation.framework',
           '$(SDKROOT)/System/Library/Frameworks/QuartzCore.framework',
           '$(SDKROOT)/System/Library/Frameworks/UIKit.framework',
         ],
@@ skipping 140 matching lines @@
         'browser/ui/uikit_ui_util.h',
         'browser/ui/uikit_ui_util.mm',
         'browser/ui/url_loader.h',
         'browser/web/dom_altering_lock.h',
         'browser/web/dom_altering_lock.mm',
         'browser/web_resource/ios_web_resource_service.cc',
         'browser/web_resource/ios_web_resource_service.h',
       ],
     },
     {
+      'target_name': 'ios_chrome_common',
+      'type': 'static_library',
+      'include_dirs': [
+        '../..',
+      ],
+      'dependencies': [
+        '../../base/base.gyp:base',
+      ],
+      'link_settings': {
+        'libraries': [
+          '$(SDKROOT)/System/Library/Frameworks/CoreGraphics.framework',
+          '$(SDKROOT)/System/Library/Frameworks/Foundation.framework',
+        ],
+      },
+      'sources': [
+        'common/string_util.h',
+        'common/string_util.mm',
+      ]
+    },
+    {
       'target_name': 'injected_js',
       'type': 'none',
       'sources': [
         'browser/find_in_page/resources/find_in_page.js',
       ],
       'includes': [
         '../../ios/web/js_compile.gypi',
       ],
       'link_settings': {
         'mac_bundle_resources': [
           '<(SHARED_INTERMEDIATE_DIR)/find_in_page.js',
         ],
       },
     },
   ],
 }