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

third_party/WebKit/LayoutTests/http/tests/inspector-protocol/resources/protocol-test.html

 <!--
 Copyright (C) 2012 Samsung Electronics. All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:
 
 1.  Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 44 matching lines @@
 
     if (InspectorTest._dumpInspectorProtocolMessages)
         testRunner.logToStderr("frontend: " + JSON.stringify(messageObject));
     var embedderMessage = { "id": ++this._embedderRequestId, "method": "dispatchProtocolMessage", "params": [JSON.stringify(messageObject)] };
     DevToolsHost.sendMessageToEmbedder(JSON.stringify(embedderMessage));
     return this._requestId;
 }
 
 InspectorTest.sendCommandOrDie = function(command, properties, callback)
 {
+    var fulfill;
+    var result = new Promise(f => fulfill = f);
+
     InspectorTest.sendCommand(command, properties || {}, commandCallback);
     function commandCallback(msg)
     {
         if (msg.error) {
             InspectorTest.log("ERROR: " + msg.error.message);
             InspectorTest.completeTest();
             return;
         }
         if (callback)
             callback(msg.result);
+        fulfill(msg.result);
     }
+    return result;
 }
 
 InspectorTest.sendCommandPromise = function(method, params)
 {
     var callback;
     var promise = new Promise(fulfill => callback = fulfill);
     InspectorTest.sendCommand(method, params, callback);
     return promise;
 }
 
@@ skipping 349 matching lines @@
             callback();
         }
     }
 }
 
 window.addEventListener("load", InspectorTest.readyForTest.bind(InspectorTest), false);
 
 </script>
 </head>
 </html>