<input type=number>: accept localized digits without showing them.

third_party/WebKit/Source/platform/text/PlatformLocale.cpp

 /*
  * Copyright (C) 2011,2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 394 matching lines @@
       builder.append(static_cast<UChar>('0' + symbolIndex));
   }
   String converted = builder.toString();
   // Ignore trailing '.', but will reject '.'-only string later.
   if (converted.length() >= 2 && converted[converted.length() - 1] == '.')
     converted = converted.left(converted.length() - 1);
   return converted;
 }
 
 String Locale::stripInvalidNumberCharacters(const String& input,
-                                            const String& standardChars) const {
+                                            const String& standardChars) {
+  initializeLocaleData();
   StringBuilder builder;
   builder.reserveCapacity(input.length());
   for (unsigned i = 0; i < input.length(); ++i) {
     UChar ch = input[i];
     if (standardChars.find(ch) != kNotFound)
       builder.append(ch);
     else if (m_acceptableNumberCharacters.find(ch) != kNotFound)
       builder.append(ch);
   }
   return builder.toString();
@@ skipping 32 matching lines @@
                         : dateTimeFormatWithSeconds());
       break;
     case DateComponents::Invalid:
       ASSERT_NOT_REACHED();
       break;
   }
   return builder.toString();
 }
 
 }  // namespace blink