Cache contains only ascii in StringImpl

third_party/WebKit/Source/wtf/text/StringImpl.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller ( mueller@kde.org )
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2013 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 287 matching lines @@
 
   if (isAtomic())
     AtomicStringTable::instance().remove(this);
 }
 
 void StringImpl::destroyIfNotStatic() {
   if (!isStatic())
     delete this;
 }
 
+void StringImpl::updateContainsOnlyASCII() const {
+  m_containsOnlyASCII = is8Bit()
+                            ? charactersAreAllASCII(characters8(), length())
+                            : charactersAreAllASCII(characters16(), length());
+  m_needsASCIICheck = false;
+}
+
 bool StringImpl::isSafeToSendToAnotherThread() const {
   if (isStatic())
     return true;
   // AtomicStrings are not safe to send between threads as ~StringImpl()
   // will try to remove them from the wrong AtomicStringTable.
   if (isAtomic())
     return false;
   if (hasOneRef())
     return true;
   return false;
@@ skipping 1852 matching lines @@
     } else if (localeIdMatchesLang(localeIdentifier, "lt")) {
       // TODO(rob.buis) implement upper-casing rules for lt
       // like in StringImpl::upper(locale).
     }
   }
 
   return toUpper(c);
 }
 
 }  // namespace WTF