DevTools: introduce a stub for the new audits panel (behind experiment).

third_party/WebKit/Source/devtools/front_end/worker_service/ServiceDispatcher.js

Index: third_party/WebKit/Source/devtools/front_end/worker_service/ServiceDispatcher.js
diff --git a/third_party/WebKit/Source/devtools/front_end/worker_service/ServiceDispatcher.js b/third_party/WebKit/Source/devtools/front_end/worker_service/ServiceDispatcher.js
index 5512e77ffca6674c6b99b2751b140999d6b3aaa6..fe4ff440426e7f92706798151ad600cd8c72b3ae 100644
--- a/third_party/WebKit/Source/devtools/front_end/worker_service/ServiceDispatcher.js
+++ b/third_party/WebKit/Source/devtools/front_end/worker_service/ServiceDispatcher.js
@@ -140,7 +140,7 @@ ServiceDispatcher.prototype = {
 
 /**
  * @constructor
- * @param {!Port} port
+ * @param {!Port|!Worker} port
  * @implements {ServicePort}
  */
 function WorkerServicePort(port)
@@ -200,6 +200,22 @@ var services = new Map();
  * @param {string} serviceName
  * @param {function(new:Service)} constructor
  */
+function initializeWorkerService(serviceName, constructor)
+{
+    services.set(serviceName, constructor);
+    if (!dispatchers.length) {
+        var worker = /** @type {!Object} */(self);
+        var servicePort = new WorkerServicePort(/** @type {!Worker} */(worker));
+        var dispatcher = new ServiceDispatcher(servicePort);
+        dispatchers.push(dispatcher);
+    }
+    dispatchers[0].registerObject(serviceName, constructor);
+}
+
+/**
+ * @param {string} serviceName
+ * @param {function(new:Service)} constructor
+ */
 function initializeSharedWorkerService(serviceName, constructor)
 {
     services.set(serviceName, constructor);