ServiceWorker: Add support for .skipWaiting and controllerchange event(2/3)

content/renderer/service_worker/embedded_worker_context_client.cc

Index: content/renderer/service_worker/embedded_worker_context_client.cc
diff --git a/content/renderer/service_worker/embedded_worker_context_client.cc b/content/renderer/service_worker/embedded_worker_context_client.cc
index 97b3ddfdc911d5356db0c20a496b1f55ea7f5135..c92ee8547c5a5c495d31022691f443a36ce3b13c 100644
--- a/content/renderer/service_worker/embedded_worker_context_client.cc
+++ b/content/renderer/service_worker/embedded_worker_context_client.cc
@@ -358,6 +358,11 @@ void EmbeddedWorkerContextClient::postMessageToClient(
                                          make_scoped_ptr(channels));
 }
 
+void EmbeddedWorkerContextClient::skipWaiting(blink::WebCallback* callback) {
+  DCHECK(script_context_);
+  script_context_->SkipWaiting(callback);
+}
+
 void EmbeddedWorkerContextClient::OnMessageToWorker(
     int thread_id,
     int embedded_worker_id,