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

ui/gfx/gfx.gyp

Index: ui/gfx/gfx.gyp
diff --git a/ui/gfx/gfx.gyp b/ui/gfx/gfx.gyp
index f1bc1f00fcf40a5fc85395a715f3fb17db8bbd57..129cd8ef055e5f436017023e43435869ac358974 100644
--- a/ui/gfx/gfx.gyp
+++ b/ui/gfx/gfx.gyp
@@ -308,6 +308,15 @@
       ],
       'conditions': [
         ['OS=="ios"', {
+          'dependencies': [
+            "<(DEPTH)/ui/ios/ios.gyp:ios",
+          ],
+          'export_dependent_settings': [

[lliabraa, 2014/08/25 19:41:52]

maybe this is not correct...I get the following warning when building a static
library that depends on gfx:
-dynamic not specified the following flags are invalid: -ObjC

Should any target that uses this new NSString category depend on ui/ios.gyp:ios
explicitly?

[stuartmorgan, 2014/08/25 20:17:37]

The ui/ gyp files aren't set up the way they used to be, and I'm not used to the
pattern they are using. It looks like yes, in this model.

[lliabraa, 2014/08/28 12:13:20]

changed to link_settings in the ui_ios.gyp file.

+            # Targets that depend on this gfx target, will also need the
+            # direct_dependent_settings of ios.gyp:ios in order to use the
+            # categories defined there.
+            "<(DEPTH)/ui/ios/ios.gyp:ios",
+          ],
           # iOS only uses a subset of UI.
           'sources/': [
             ['exclude', '^codec/jpeg_codec\\.cc$'],