[CSS Grid Layout] the "grid-template-areas" is not identified as computable property.

LayoutTests/inspector/elements/styles/styles-computed-trace.html

Index: LayoutTests/inspector/elements/styles/styles-computed-trace.html
diff --git a/LayoutTests/inspector/elements/styles/styles-computed-trace.html b/LayoutTests/inspector/elements/styles/styles-computed-trace.html
index 24274d125adcbfd0c78247be3ada10692a38228e..5bcd7e8b44912786b26acc1453fd19065d7e5e88 100644
--- a/LayoutTests/inspector/elements/styles/styles-computed-trace.html
+++ b/LayoutTests/inspector/elements/styles/styles-computed-trace.html
@@ -30,6 +30,11 @@ div {
     text-decoration: invalidvalue;
 }
 
+#id4 {

[apavlov, 2014/03/21 16:50:39]

This is not the right place to test the new functionality. This test is about
checking whether the DevTools' computed trace works correctly. Instead, place
your test in LayoutTests/fast/css/getComputedStyle/. As a bonus, it will run
much much faster.

+    display: grid;
+    grid-template-areas: "a";
+}
+
 </style>
 <script src="../../../http/tests/inspector/inspector-test.js"></script>
 <script src="../../../http/tests/inspector/elements-test.js"></script>
@@ -58,9 +63,15 @@ function test()
         InspectorTest.addResult("==== Style for ID3 ====");
         // The button[hidden] style specifies "display: none", which should not be /-- overloaded --/.
         InspectorTest.dumpSelectedElementStyles(true, true);
-        InspectorTest.completeTest();
+        InspectorTest.selectNodeAndWaitForStylesWithComputed("id4", step4);
     }
 
+    function step4()
+    {
+        InspectorTest.addResult("==== Style for ID4 (Grid Layout properties ====");
+        InspectorTest.dumpSelectedElementStyles(false, true);
+        InspectorTest.completeTest();
+    }
 }
 </script>
 </head>
@@ -75,6 +86,7 @@ Tests that computed styles expand and allow tracing to style rules.
 </div>
 <button id="id3" hidden />
 </div>
+<div id="id4"/>
 
 </body>
 </html>