Subresource Integrity: Improve parsing.

Source/platform/ParsingUtilities.h

Index: Source/platform/ParsingUtilities.h
diff --git a/Source/platform/ParsingUtilities.h b/Source/platform/ParsingUtilities.h
index 882b800bf398e9e951aa39e1ff22bf40c48243ad..3ba75629a2d4d8437f62e4649c7c8d975117eeea 100644
--- a/Source/platform/ParsingUtilities.h
+++ b/Source/platform/ParsingUtilities.h
@@ -51,7 +51,24 @@ bool skipExactly(const CharType*& position, const CharType* end)
     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)