Use VTTScanner for VTT region settings parsing

Source/core/html/track/vtt/VTTScanner.h

 /*
  * Copyright (c) 2013, Opera Software ASA. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 73 matching lines @@
     // Scan the literal |characters|.
     template<unsigned charactersCount>
     bool scan(const char (&characters)[charactersCount]);
 
     // Skip (advance the input pointer) as long as the specified
     // |characterPredicate| returns true, and the input pointer is not passed
     // the end of the input.
     template<bool characterPredicate(UChar)>
     void skipWhile();
 
+    // Like skipWhile, but using a negated predicate.
+    template<bool characterPredicate(UChar)>
+    void skipUntil();
+
     // Return the run of characters for which the specified
     // |characterPredicate| returns true. The start of the run will be the
     // current input pointer.
     template<bool characterPredicate(UChar)>
     Run collectWhile();
 
     // Like collectWhile, but using a negated predicate.
     template<bool characterPredicate(UChar)>
     Run collectUntil();
 
@@ skipping 55 matching lines @@
 template<bool characterPredicate(UChar)>
 inline void VTTScanner::skipWhile()
 {
     if (m_is8Bit)
         ::skipWhile<LChar, LCharPredicateAdapter<characterPredicate> >(m_data.characters8, m_end.characters8);
     else
         ::skipWhile<UChar, characterPredicate>(m_data.characters16, m_end.characters16);
 }
 
 template<bool characterPredicate(UChar)>
+inline void VTTScanner::skipUntil()
+{
+    if (m_is8Bit)
+        ::skipUntil<LChar, LCharPredicateAdapter<characterPredicate> >(m_data.characters8, m_end.characters8);
+    else
+        ::skipUntil<UChar, characterPredicate>(m_data.characters16, m_end.characters16);
+}
+
+template<bool characterPredicate(UChar)>
 inline VTTScanner::Run VTTScanner::collectWhile()
 {
     if (m_is8Bit) {
         const LChar* current = m_data.characters8;
         ::skipWhile<LChar, LCharPredicateAdapter<characterPredicate> >(current, m_end.characters8);
         return Run(position(), current, m_is8Bit);
     }
     const UChar* current = m_data.characters16;
     ::skipWhile<UChar, characterPredicate>(current, m_end.characters16);
     return Run(position(), reinterpret_cast<Position>(current), m_is8Bit);
@@ skipping 62 matching lines @@
     unsigned* m_outPosition;
     union {
         const LChar* characters8;
         const UChar* characters16;
     } m_start;
 };
 
 }
 
 #endif