Add basic browser test for EmbeddedWorker/ServiceWorker

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 1088d2901e7fc93cfb3bb4eb764ae33962d22cfa..fe95816624566364abdce3c83d4274d4ca19f573 100644
--- a/content/renderer/service_worker/embedded_worker_context_client.cc
+++ b/content/renderer/service_worker/embedded_worker_context_client.cc
@@ -53,6 +53,7 @@ EmbeddedWorkerContextClient::EmbeddedWorkerContextClient(
       sender_(ChildThread::current()->thread_safe_sender()),
       main_thread_proxy_(base::MessageLoopProxy::current()),
       proxy_(NULL) {
+  g_worker_client_tls.Pointer()->Set(this);
 }
 
 EmbeddedWorkerContextClient::~EmbeddedWorkerContextClient() {
@@ -91,7 +92,8 @@ void EmbeddedWorkerContextClient::workerContextStarted(
 }
 
 void EmbeddedWorkerContextClient::workerContextDestroyed() {
-  DCHECK_NE(0, WorkerTaskRunner::Instance()->CurrentWorkerId());
+  // At this point OnWorkerRunLoopStopped is already called, so
+  // CurrentWorkerId() returns 0 (while we're still on the worker thread).
   proxy_ = NULL;
   main_thread_proxy_->PostTask(
       FROM_HERE,