[Autofill] Determine Popup RTLness from page

base/i18n/rtl.h

 // Copyright (c) 2011 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.
 
 #ifndef BASE_I18N_RTL_H_
 #define BASE_I18N_RTL_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 13 matching lines @@
 const char16 kRightToLeftEmbeddingMark = 0x202B;
 const char16 kPopDirectionalFormatting = 0x202C;
 const char16 kLeftToRightOverride = 0x202D;
 const char16 kRightToLeftOverride = 0x202E;
 
 // Locale.java mirrored this enum TextDirection. Please keep in sync.
 enum TextDirection {
   UNKNOWN_DIRECTION = 0,
   RIGHT_TO_LEFT = 1,
   LEFT_TO_RIGHT = 2,
+  TEXT_DIRECTION_NUM_DIRECTIONS = 3,
 };
 
 // Get the locale that the currently running process has been configured to use.
 // The return value is of the form language[-country] (e.g., en-US) where the
 // language is the 2 or 3 letter code from ISO-639.
 BASE_I18N_EXPORT std::string GetConfiguredLocale();
 
 // Canonicalize a string (eg. a POSIX locale string) to a Chrome locale name.
 BASE_I18N_EXPORT std::string GetCanonicalLocale(const char* locale);
 
@@ skipping 93 matching lines @@
 // return the text itself. Explicit bidi control characters display and have
 // semantic effect. They can be deleted so they might not always appear in a
 // pair.
 BASE_I18N_EXPORT string16 StripWrappingBidiControlCharacters(
     const string16& text) WARN_UNUSED_RESULT;
 
 }  // namespace i18n
 }  // namespace base
 
 #endif  // BASE_I18N_RTL_H_