Support XCode's "Right to Left Pseudolanguage" on iOS.

base/ios/ios_util.h

Index: base/ios/ios_util.h
diff --git a/base/ios/ios_util.h b/base/ios/ios_util.h
index 688fbf3ba9faeca022fc0f3975db22d6f943a28a..e6248e97f094a35f0c28465bd86bbf77d3772f74 100644
--- a/base/ios/ios_util.h
+++ b/base/ios/ios_util.h
@@ -20,6 +20,10 @@ BASE_EXPORT bool IsRunningOnIOS9OrLater();
 // Returns whether the operating system is at the given version or later.
 BASE_EXPORT bool IsRunningOnOrLater(int32 major, int32 minor, int32 bug_fix);
 
+// Returns whether iOS is signalling that an RTL text direction should be used
+// regardless of the current locale.
+BASE_EXPORT bool IsInForcedRTL();
+
 }  // namespace ios
 }  // namespace base