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

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

 function test()
 {
     var documentNodeId;
     var documentNodeSelector;
     var testSelectors = [];
     var collectedFontUsage = {};
 
     InspectorTest.requestDocumentNodeId(onDocumentNodeId);
 
     function onDocumentNodeId(nodeId)
@@ skipping 39 matching lines @@
         // the content_shell text dump is easier to validate.
         InspectorTest.evaluateInInspectedPage("injectCollectedResultsInPage(" +
                                               JSON.stringify(collectedFontUsage) +
                                               ")");
         InspectorTest.evaluateInInspectedPage("postTestHookWithFontResults(" +
                                               JSON.stringify(collectedFontUsage) +
                                               ")");
 
     }
 
-    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)
     {
         var usedFonts = response.fonts;
         usedFonts.sort(function(a, b) {
             return b.glyphCount - a.glyphCount;
         });
         collectedFontUsage[documentNodeSelector] = usedFonts;
     }
@@ skipping 25 matching lines @@
         var resultTextNode = document.createTextNode(resultText);
         resultTextPre.appendChild(resultTextNode);
         resultElement.appendChild(resultTextPre);
         testNode.parentNode.insertBefore(resultElement, testNode.nextSibling);
     }
 }
 
 window.addEventListener("DOMContentLoaded", function () {
     runTest();
 }, false);