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

base/i18n/rtl.cc

Index: base/i18n/rtl.cc
diff --git a/base/i18n/rtl.cc b/base/i18n/rtl.cc
index 1cccae289375f92495963cee7bbc9341167a8a48..1c873a60e622e386e04603fc2dccc6a21eb71aae 100644
--- a/base/i18n/rtl.cc
+++ b/base/i18n/rtl.cc
@@ -14,6 +14,10 @@
 #include "third_party/icu/source/common/unicode/uscript.h"
 #include "third_party/icu/source/i18n/unicode/coll.h"
 
+#if defined(OS_IOS)
+#include "base/ios/ios_util.h"
+#endif
+
 namespace {
 
 // Extract language, country and variant, but ignore keywords.  For example,
@@ -131,6 +135,11 @@ bool ICUIsRTL() {
 }
 
 TextDirection GetTextDirectionForLocale(const char* locale_name) {
+  // On iOS, check for RTL forcing.
+#if defined(OS_IOS)
+  if (ios::IsForcingRTL())

[jungshik at Google, 2015/08/07 17:32:22]

nit: How about IsInForcedRTL ? 

[marq (ping after 24h), 2015/08/10 07:28:37]

Done.

+    return RIGHT_TO_LEFT;
+#endif
   UErrorCode status = U_ZERO_ERROR;
   ULayoutType layout_dir = uloc_getCharacterOrientation(locale_name, &status);
   DCHECK(U_SUCCESS(status));