DevTools: require enabling CSS domain before running CSS.* commands.

third_party/WebKit/LayoutTests/inspector-protocol/layout-fonts/resources/layout-font-test.js

Index: third_party/WebKit/LayoutTests/inspector-protocol/layout-fonts/resources/layout-font-test.js
diff --git a/third_party/WebKit/LayoutTests/inspector-protocol/layout-fonts/resources/layout-font-test.js b/third_party/WebKit/LayoutTests/inspector-protocol/layout-fonts/resources/layout-font-test.js
index f3efc867dbe447c503b6f2714929208aa9567414..996ca6b445380c5afe4ec10923c24807d16d32cb 100644
--- a/third_party/WebKit/LayoutTests/inspector-protocol/layout-fonts/resources/layout-font-test.js
+++ b/third_party/WebKit/LayoutTests/inspector-protocol/layout-fonts/resources/layout-font-test.js
@@ -57,20 +57,13 @@ function test()
 
     }
 
-    function platformFontsForElementWithSelector(selector)
+    async function platformFontsForElementWithSelector(selector)
     {
-        InspectorTest.requestNodeId(documentNodeId, selector, onNodeId);
-
-        function onNodeId(nodeId)
-        {
-            InspectorTest.sendCommandOrDie("CSS.getPlatformFontsForNode", { nodeId: nodeId }, onGotComputedFonts);
-        }
-
-        function onGotComputedFonts(response)
-        {
-            collectResults(response);
-            testNextPageElement();
-        }
+        var nodeId = await InspectorTest.requestNodeId(documentNodeId, selector);
+        await InspectorTest.sendCommandOrDie("CSS.enable", {});
+        var response = await InspectorTest.sendCommandOrDie("CSS.getPlatformFontsForNode", { nodeId: nodeId });
+        collectResults(response);
+        testNextPageElement();
     }
 
     function collectResults(response)