Sync CSS interfaces with the specs

Source/core/css/CSSRule.idl

 /*
  * Copyright (C) 2006, 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
-// Introduced in DOM Level 2:
 // http://dev.w3.org/csswg/cssom/#the-cssrule-interface
+
 [
     DependentLifetime,
     WillBeGarbageCollected,
 ] interface CSSRule {
-    // RuleType
+    // TODO(philipj): UNKNOWN_RULE has been removed from the spec.
     const unsigned short UNKNOWN_RULE = 0;
     const unsigned short STYLE_RULE = 1;
     const unsigned short CHARSET_RULE = 2;
     const unsigned short IMPORT_RULE = 3;
     const unsigned short MEDIA_RULE = 4;
     const unsigned short FONT_FACE_RULE = 5;
     const unsigned short PAGE_RULE = 6;
+    // TODO(philipj): Implement CSSMarginRule.
+    // const unsigned short MARGIN_RULE = 9;
+    // TODO(philipj): Implement CSSNamespaceRule. crbug.com/389549
+    // const unsigned short NAMESPACE_RULE = 10;
+    readonly attribute unsigned short type;
+    attribute DOMString cssText;
+    readonly attribute CSSRule? parentRule;
+    readonly attribute CSSStyleSheet? parentStyleSheet;
+
+    // CSS Animations
+    // http://dev.w3.org/csswg/css-animations/#interface-cssrule
     const unsigned short KEYFRAMES_RULE = 7;
-    const unsigned short WEBKIT_KEYFRAMES_RULE = 7;
     const unsigned short KEYFRAME_RULE = 8;
-    const unsigned short WEBKIT_KEYFRAME_RULE = 8;
+
+    // CSS Conditional Rules
+    // http://dev.w3.org/csswg/css-conditional/#extentions-to-cssrule-interface
     const unsigned short SUPPORTS_RULE = 12;
+
+    // CSS Device Adaptation
+    // http://dev.w3.org/csswg/css-device-adapt/#css-rule-interface
     [RuntimeEnabled=CSSViewport] const unsigned short VIEWPORT_RULE = 15;
 
-    readonly attribute unsigned short   type;
-
-             attribute DOMString        cssText;
-
-    readonly attribute CSSStyleSheet    parentStyleSheet;
-    readonly attribute CSSRule          parentRule;
+    // Non-standard APIs
+    const unsigned short WEBKIT_KEYFRAMES_RULE = 7;
+    const unsigned short WEBKIT_KEYFRAME_RULE = 8;
 };