Add CSS parser recovery from errors while parsing @-webkit-keyframes key values.

Source/WebCore/css/CSSGrammar.y.in

Index: Source/WebCore/css/CSSGrammar.y.in
diff --git a/Source/WebCore/css/CSSGrammar.y.in b/Source/WebCore/css/CSSGrammar.y.in
index 9543cbead6f9f1da23567ec934cb740a2cb4b194..2706ace2cec3c038de053b9ee9d2cf47d9634ee8 100644
--- a/Source/WebCore/css/CSSGrammar.y.in
+++ b/Source/WebCore/css/CSSGrammar.y.in
@@ -855,8 +855,13 @@ key:
             $$.fValue = 0;
         else if (str.equalIgnoringCase("to"))
             $$.fValue = 100;
-        else
+        else {
+            $$.isInt = true;

[hayato, 2013/04/17 04:01:18]

'isInt' looks confusing name since it is not a number.
'isInvalid' or something might be better.

             YYERROR;
+        }
+    }
+    | error {
+        $$.isInt = true;
     }
     ;