Add NSString category for providing iOS6-style string drawing APIs.

ui/ios/ios.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': [
+    {
+      'target_name': 'ios',
+      'type': 'static_library',
+      'direct_dependent_settings': {
+        # Dependents need to set the linker flag '-ObjC' in order to use
+        # categories in this target (e.g. NSString+CrStringDrawing.h).
+        'xcode_settings': {'OTHER_LDFLAGS': ['-ObjC']},
+      },
+      'include_dirs': [
+        '../..',
+      ],
+      'sources': [
+        'NSString+CrStringDrawing.h',
+        'NSString+CrStringDrawing.mm',
+      ],
+    },
+  ],
+}