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

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

Index: third_party/WebKit/LayoutTests/http/tests/inspector-protocol/resources/protocol-test.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/inspector-protocol/resources/protocol-test.html b/third_party/WebKit/LayoutTests/http/tests/inspector-protocol/resources/protocol-test.html
index 510b44164d4735fe48751d0dd7451dc8e314c44a..1f3ce3cf19a26447d56d654cdd5f15ad1b05188e 100644
--- a/third_party/WebKit/LayoutTests/http/tests/inspector-protocol/resources/protocol-test.html
+++ b/third_party/WebKit/LayoutTests/http/tests/inspector-protocol/resources/protocol-test.html
@@ -62,6 +62,9 @@ InspectorTest.sendCommand = function(method, params, handler)
 
 InspectorTest.sendCommandOrDie = function(command, properties, callback)
 {
+    var fulfill;
+    var result = new Promise(f => fulfill = f);
+
     InspectorTest.sendCommand(command, properties || {}, commandCallback);
     function commandCallback(msg)
     {
@@ -72,7 +75,9 @@ InspectorTest.sendCommandOrDie = function(command, properties, callback)
         }
         if (callback)
             callback(msg.result);
+        fulfill(msg.result);
     }
+    return result;
 }
 
 InspectorTest.sendCommandPromise = function(method, params)