DevTools: Split creating inspector stylesheet and adding a new rule into stylesheet in protocol.

LayoutTests/http/tests/inspector-protocol/inspector-protocol-test.js

 /*
  * Copyright (C) 2012 Samsung Electronics. All rights reserved.
  * Copyright (C) 2013 Google Inc. 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.
@@ skipping 33 matching lines @@
 
     var messageObject = { "method": method,
                           "params": params,
                           "id": this._requestId };
 
     InspectorFrontendHost.sendMessageToBackend(JSON.stringify(messageObject));
 
     return this._requestId;
 }
 
+InspectorTest.sendCommandOrDie = function(command, properties, callback)
+{
+    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);
+    }
+}
+
 /**
  * @param {function(object)=} callback
  */
 InspectorTest.wrapCallback = function(callback)
 {
     /**
      * @param {object} message
      */
     function callbackWrapper(message)
     {
@@ skipping 251 matching lines @@
                 initializers += "(" + window[symbol].toString() + ")();\n";
             }
             inspectorFrontend.postMessage(initializers + "(" + testFunction.toString() +")();", "*");
             return;
         }
         // Kill waiting process if failed to send.
         alert("Failed to send test function");
         testRunner.notifyDone();
     });
 }