CSS Parser: Implement parseRule

Source/core/css/parser/CSSParserImpl.h

Index: Source/core/css/parser/CSSParserImpl.h
diff --git a/Source/core/css/parser/CSSParserImpl.h b/Source/core/css/parser/CSSParserImpl.h
index 15301b98a6146ec4a30e6b360b68121e16413bb7..e041f241da20232c72b2049cf933eeeb099a0be1 100644
--- a/Source/core/css/parser/CSSParserImpl.h
+++ b/Source/core/css/parser/CSSParserImpl.h
@@ -16,6 +16,7 @@
 
 namespace blink {
 
+class StyleRuleBase;
 class ImmutableStylePropertySet;
 class Element;
 class MutableStylePropertySet;
@@ -27,8 +28,13 @@ public:
     static bool parseValue(MutableStylePropertySet*, CSSPropertyID, const String&, bool important, const CSSParserContext&);
     static PassRefPtrWillBeRawPtr<ImmutableStylePropertySet> parseInlineStyleDeclaration(const String&, Element*);
     static bool parseDeclaration(MutableStylePropertySet*, const String&, const CSSParserContext&);
+    static PassRefPtrWillBeRawPtr<StyleRuleBase> parseRule(const String&, const CSSParserContext&);
 
 private:
+    // These two functions update the range they're given
+    PassRefPtrWillBeRawPtr<StyleRuleBase> consumeAtRule(CSSParserTokenRange&);

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

Eventually these two will take an enum along the lines of

enum AllowedRules {
 RegularRuleCharsetAllowed, // charset, import, namespace allowed
 RegularRuleImportAllowed, // import, namespace allowed
 RegularRuleNamespaceAllowed,
 RegularRule,
 KeyframesRule,
}

The top-level flag only needs to be considered by the not-yet-implemented
consumeRuleList, and @page rules are actually declaration lists instead of rule
lists.

+    PassRefPtrWillBeRawPtr<StyleRuleBase> consumeQualifiedRule(CSSParserTokenRange&);
+
     // FIXME: We should use a CSSRule::Type here
     void consumeDeclarationList(CSSParserTokenRange, CSSRuleSourceData::Type);
     void consumeDeclaration(CSSParserTokenRange, CSSRuleSourceData::Type);