Implement support for unprefixed keyframes rules resolution.

Source/core/css/CSSGrammar.y.in

 /*
  *  Copyright (C) 2002-2003 Lars Knoll (knoll@kde.org)
  *  Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  *  Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *  Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  *  Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
@@ skipping 124 matching lines @@
 %token CHARSET_SYM
 %token NAMESPACE_SYM
 %token VIEWPORT_RULE_SYM
 %token INTERNAL_DECLS_SYM
 %token INTERNAL_MEDIALIST_SYM
 %token INTERNAL_RULE_SYM
 %token INTERNAL_SELECTOR_SYM
 %token INTERNAL_VALUE_SYM
 %token INTERNAL_KEYFRAME_RULE_SYM
 %token INTERNAL_SUPPORTS_CONDITION_SYM
+%token KEYFRAMES_SYM
 %token WEBKIT_KEYFRAMES_SYM
 %token WEBKIT_REGION_RULE_SYM
 %token WEBKIT_FILTER_RULE_SYM
 %token <marginBox> TOPLEFTCORNER_SYM
 %token <marginBox> TOPLEFT_SYM
 %token <marginBox> TOPCENTER_SYM
 %token <marginBox> TOPRIGHT_SYM
 %token <marginBox> TOPRIGHTCORNER_SYM
 %token <marginBox> BOTTOMLEFTCORNER_SYM
 %token <marginBox> BOTTOMLEFT_SYM
@@ skipping 660 matching lines @@
     }
     ;
 
 before_keyframes_rule:
     /* empty */ {
         parser->startRuleHeader(CSSRuleSourceData::KEYFRAMES_RULE);
     }
     ;
 
 keyframes:
+    before_keyframes_rule KEYFRAMES_SYM maybe_space keyframe_name at_rule_header_end_maybe_space '{' at_rule_body_start maybe_space location_label keyframes_rule closing_brace {
+        $$ = parser->createKeyframesRule($4, parser->sinkFloatingKeyframeVector($10), false /* isPrefixed */);
+    }
+  |
     before_keyframes_rule WEBKIT_KEYFRAMES_SYM maybe_space keyframe_name at_rule_header_end_maybe_space '{' at_rule_body_start maybe_space location_label keyframes_rule closing_brace {
-        $$ = parser->createKeyframesRule($4, parser->sinkFloatingKeyframeVector($10));
+        $$ = parser->createKeyframesRule($4, parser->sinkFloatingKeyframeVector($10), true /* isPrefixed */);
+    }
+  | before_keyframes_rule KEYFRAMES_SYM at_rule_recovery {
+        $$ = 0;
+        parser->endRuleBody(true);
     }
   | before_keyframes_rule WEBKIT_KEYFRAMES_SYM at_rule_recovery {
         $$ = 0;
         parser->endRuleBody(true);
     }
     ;
 
 keyframe_name:
     IDENT
     | STRING
@@ skipping 1068 matching lines @@
 
 rule_error_recovery:
     /* empty */
   | rule_error_recovery error
   | rule_error_recovery invalid_square_brackets_block
   | rule_error_recovery invalid_parentheses_block
     ;
 
 %%