Subresource Integrity: Improve parsing.

Source/platform/ParsingUtilities.h

 /*
  * Copyright (C) 2013 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 33 matching lines @@
 template<typename CharType, bool characterPredicate(CharType)>
 bool skipExactly(const CharType*& position, const CharType* end)
 {
     if (position < end && characterPredicate(*position)) {
         ++position;
         return true;
     }
     return false;
 }
 
-template<typename CharType>
+template <typename CharType>
+bool skipToken(const CharType*& position, const CharType* end, const char* token)
+{
+    const CharType* current = position;
+    while (current < end && *token) {
+        if (*current != *token)
+            return false;
+        ++current;
+        ++token;
+    }
+    if (*token)
+        return false;
+
+    position = current;
+    return true;
+}
+
+template <typename CharType>
 void skipUntil(const CharType*& position, const CharType* end, CharType delimiter)
 {
     while (position < end && *position != delimiter)
         ++position;
 }
 
 template<typename CharType, bool characterPredicate(CharType)>
 void skipUntil(const CharType*& position, const CharType* end)
 {
     while (position < end && !characterPredicate(*position))
         ++position;
 }
 
 template<typename CharType, bool characterPredicate(CharType)>
 void skipWhile(const CharType*& position, const CharType* end)
 {
     while (position < end && characterPredicate(*position))
         ++position;
 }
 
 template<typename CharType, bool characterPredicate(CharType)>
 void reverseSkipWhile(const CharType*& position, const CharType* start)
 {
     while (position >= start && characterPredicate(*position))
         --position;
 }
 
 #endif