CSS Tokenizer: Add an on-stack tokenizer scope

Source/core/css/parser/CSSParserValuesTest.cpp

 /*
  * Copyright 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 87 matching lines @@
         value.setFromNumber(3);
         list.addValue(value);
     }
     list.clearAndLeakValues();
     ASSERT_FALSE(list.size());
     ASSERT_FALSE(list.currentIndex());
 }
 
 TEST(CSSParserValuesTest, CSSParserTokenUrlConversion)
 {
-    Vector<CSSParserToken> tokens;
-    CSSTokenizer::tokenize("url(some) uRL('test') UrL(  \"words\" /**/ ) URl( /**/hi/**/ )", tokens);
-    CSSParserTokenRange range(tokens);
-    CSSParserValueList valueList(range);
+    CSSTokenizer::Scope scope("url(some) uRL('test') UrL(  \"words\" /**/ ) URl( /**/hi/**/ )");
+    CSSParserValueList valueList(scope.tokenRange());
     ASSERT_EQ(valueList.size(), 4u);
     ASSERT_EQ(valueList.valueAt(0)->unit, CSSPrimitiveValue::CSS_URI);
     EXPECT_EQ(String(valueList.valueAt(0)->string), "some");
     ASSERT_EQ(valueList.valueAt(1)->unit, CSSPrimitiveValue::CSS_URI);
     EXPECT_EQ(String(valueList.valueAt(1)->string), "test");
     ASSERT_EQ(valueList.valueAt(2)->unit, CSSPrimitiveValue::CSS_URI);
     EXPECT_EQ(String(valueList.valueAt(2)->string), "words");
     ASSERT_EQ(valueList.valueAt(3)->unit, CSSPrimitiveValue::CSS_URI);
     EXPECT_EQ(String(valueList.valueAt(3)->string), "/**/hi/**/");
 }
 
 } // namespace