Add initial/inherit/unset tests to font-family-parse-keyword.html

LayoutTests/fast/css/font-family-parse-keyword.html

Index: LayoutTests/fast/css/font-family-parse-keyword.html
diff --git a/LayoutTests/fast/css/font-family-parse-keyword.html b/LayoutTests/fast/css/font-family-parse-keyword.html
index 10bdc692c914c610e4ec3c5dd33d896eab688c99..bc763d1507abbb55fe6c258c9a6adfdea48bc496 100644
--- a/LayoutTests/fast/css/font-family-parse-keyword.html
+++ b/LayoutTests/fast/css/font-family-parse-keyword.html
@@ -17,16 +17,21 @@
     <p>
         http://crbug.com/226632 - CSSParser::parseFontFamily should allow
         the keyword "default" as part of a font name.
+        http://crbug.com/389148 - Invalid declaration "font-family: Times,
+        inherit" is treated as valid.
     </p>
     <p>
-        The next 7 lines should use the default font (same as this line):<br>
+        The next 11 lines should use the default font (same as this line):<br>
         Test 1<br>
         <span style="font-family: default">Test 2</span><br>
         <span style="font-family: default, invalid">Test 3</span><br>
         <span style="font-family: invalid, default">Test 4</span><br>
         <span style="font-family: default, arial">Test 5</span><br>
         <span style="font-family: arial, default">Test 6</span><br>
-        <span style="font-family: invalid, default, arial">Test 7</span>
+        <span style="font-family: invalid, default, arial">Test 7</span><br>
+        <span style="font-family: arial, inherit">Test 8</span><br>
+        <span style="font-family: arial, initial">Test 9</span><br>
+        <span style="font-family: arial, unset">Test 10</span>
     </p>
     <p>
         The next 3 lines should use the font Arial:<br>