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

third_party/WebKit/LayoutTests/http/tests/inspector-protocol/dom-protocol-test.js

 function initialize_domTest()
 {
 
 InspectorTest.trackGetChildNodesEvents = function(nodeInfo, callback)
 {
-    InspectorTest.eventHandler["DOM.setChildNodes"] = setChildNodes;
+  InspectorTest.eventHandler["DOM.setChildNodes"] = setChildNodes;
 
-    function setChildNodes(message)
-    {
-        var nodes = message.params.nodes;
-        for (var i = 0; i < nodes.length; ++i)
-            InspectorTest.addNode(nodeInfo, nodes[i]);
-        if (callback)
-            callback();
-    }
+  function setChildNodes(message)
+  {
+      var nodes = message.params.nodes;
+      for (var i = 0; i < nodes.length; ++i)
+        InspectorTest.addNode(nodeInfo, nodes[i]);
+      if (callback)
+        callback();
+  }
 }
 
 InspectorTest.addNode = function(nodeInfo, node)
 {
-    nodeInfo[node.nodeId] = node;
-    delete node.nodeId;
-    var children = node.children || [];
-    for (var i = 0; i < children.length; ++i)
-        InspectorTest.addNode(nodeInfo, children[i]);
-    var shadowRoots = node.shadowRoots || [];
-    for (var i = 0; i < shadowRoots.length; ++i)
-        InspectorTest.addNode(nodeInfo, shadowRoots[i]);
+  nodeInfo[node.nodeId] = node;
+  delete node.nodeId;
+  var children = node.children || [];
+  for (var i = 0; i < children.length; ++i)
+    InspectorTest.addNode(nodeInfo, children[i]);
+  var shadowRoots = node.shadowRoots || [];
+  for (var i = 0; i < shadowRoots.length; ++i)
+    InspectorTest.addNode(nodeInfo, shadowRoots[i]);
 }
 
-InspectorTest.requestDocumentNodeId = function(callback)
+InspectorTest.requestDocumentNodeId = async function(callback)
 {
-    InspectorTest.sendCommandOrDie("DOM.getDocument", {}, onGotDocument);
-
-    function onGotDocument(result)
-    {
-        callback(result.root.nodeId);
-    }
+    var result = await InspectorTest.sendCommandOrDie("DOM.getDocument", {});
+    if (callback)
+      callback(result.root.nodeId);
+    return result.root.nodeId;
 };
 
-InspectorTest.requestNodeId = function(documentNodeId, selector, callback)
+InspectorTest.requestNodeId = async function(documentNodeId, selector, callback)
 {
-    InspectorTest.sendCommandOrDie("DOM.querySelector", { "nodeId": documentNodeId , "selector": selector }, onGotNode);
-
-    function onGotNode(result)
-    {
-        callback(result.nodeId);
-    }
+    var result = await InspectorTest.sendCommandOrDie("DOM.querySelector", { "nodeId": documentNodeId , "selector": selector });
+    if (callback)
+      callback(result.nodeId);
+    return result.nodeId;
 };
 
 }