CSS Parser: Implement parseRule

Source/core/css/parser/CSSParserTokenRange.h

Index: Source/core/css/parser/CSSParserTokenRange.h
diff --git a/Source/core/css/parser/CSSParserTokenRange.h b/Source/core/css/parser/CSSParserTokenRange.h
index 0f38f7c0882903848283bbb97652e7c263d677b8..9e561ae54158c14dd77a68e787f5df869e869ea5 100644
--- a/Source/core/css/parser/CSSParserTokenRange.h
+++ b/Source/core/css/parser/CSSParserTokenRange.h
@@ -58,6 +58,9 @@ public:
         return result;
     }
 
+    // The returned range doesn't include the brackets
+    CSSParserTokenRange consumeBlock();

[Timothy Loh, 2014/12/16 00:01:20]

This is almost the same as consumeComponentValue, except that it's awkward to
find a block's content range using consumeComponentValue (after advancing past a
component value, if the next token is an EOF token we can't tell if the block
ended early)

+
     void consumeComponentValue();
     void consumeWhitespaceAndComments();