Teach EmbeddedWorkerInstance to create a process when it needs one.

content/browser/service_worker/embedded_worker_registry.cc

Index: content/browser/service_worker/embedded_worker_registry.cc
diff --git a/content/browser/service_worker/embedded_worker_registry.cc b/content/browser/service_worker/embedded_worker_registry.cc
index 249eab082b21ce3100114299d1da2811217b671b..db0a12818cfdea4744f6f2bc7c8b3f22e5ec1d2c 100644
--- a/content/browser/service_worker/embedded_worker_registry.cc
+++ b/content/browser/service_worker/embedded_worker_registry.cc
@@ -7,7 +7,9 @@
 #include "base/stl_util.h"
 #include "content/browser/service_worker/embedded_worker_instance.h"
 #include "content/browser/service_worker/service_worker_context_core.h"
+#include "content/browser/service_worker/service_worker_context_wrapper.h"
 #include "content/common/service_worker/embedded_worker_messages.h"
+#include "content/public/browser/browser_thread.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_sender.h"
 
@@ -25,20 +27,54 @@ scoped_ptr<EmbeddedWorkerInstance> EmbeddedWorkerRegistry::CreateWorker() {
   return worker.Pass();
 }
 
-ServiceWorkerStatusCode EmbeddedWorkerRegistry::StartWorker(
-    int process_id,
+void EmbeddedWorkerRegistry::StartWorker(const std::vector<int>& process_ids,
+                                         int embedded_worker_id,
+                                         int64 service_worker_version_id,
+                                         const GURL& scope,
+                                         const GURL& script_url,
+                                         const StatusCallback& callback) {
+  BrowserThread::PostTask(
+      BrowserThread::UI,
+      FROM_HERE,
+      base::Bind(
+          &ServiceWorkerContextWrapper::IncrementWorkerRef,
+          context_->wrapper(),
+          process_ids,
+          script_url,
+          base::Bind(&EmbeddedWorkerRegistry::StartWorkerWithProcessId,
+                     this,
+                     embedded_worker_id,
+                     Passed(make_scoped_ptr(new EmbeddedWorkerMsg_StartWorker(
+                         embedded_worker_id,
+                         service_worker_version_id,
+                         scope,
+                         script_url))),
+                     callback)));
+}
+
+void EmbeddedWorkerRegistry::StartWorkerWithProcessId(
     int embedded_worker_id,
-    int64 service_worker_version_id,
-    const GURL& scope,
-    const GURL& script_url) {
-  return Send(
-      process_id,
-      new EmbeddedWorkerMsg_StartWorker(
-          embedded_worker_id, service_worker_version_id, scope, script_url));
+    scoped_ptr<EmbeddedWorkerMsg_StartWorker> message,
+    const StatusCallback& callback,
+    ServiceWorkerStatusCode status,
+    int process_id) {
+  DCHECK(ContainsKey(worker_map_, embedded_worker_id));
+  worker_map_[embedded_worker_id]->RecordProcessId(process_id, status);
+
+  if (status != SERVICE_WORKER_OK) {
+    callback.Run(status);
+    return;
+  }
+  DCHECK(ContainsKey(process_sender_map_, process_id));
+  callback.Run(Send(process_id, message.release()));
 }
 
 ServiceWorkerStatusCode EmbeddedWorkerRegistry::StopWorker(
     int process_id, int embedded_worker_id) {
+  BrowserThread::PostTask(
+      BrowserThread::UI,
+      FROM_HERE,
+      base::Bind(&ServiceWorkerContextWrapper::DecrementWorkerRef, process_id));
   return Send(process_id,
               new EmbeddedWorkerMsg_StopWorker(embedded_worker_id));
 }
@@ -55,6 +91,14 @@ bool EmbeddedWorkerRegistry::OnMessageReceived(const IPC::Message& message) {
   return found->second->OnMessageReceived(message);
 }
 
+void EmbeddedWorkerRegistry::Shutdown() {
+  for (WorkerInstanceMap::iterator it = worker_map_.begin();
+       it != worker_map_.end();
+       ++it) {
+    it->second->Stop();
+  }
+}
+
 void EmbeddedWorkerRegistry::OnWorkerStarted(
     int process_id, int thread_id, int embedded_worker_id) {
   DCHECK(!ContainsKey(worker_process_map_, process_id) ||
@@ -143,7 +187,9 @@ EmbeddedWorkerInstance* EmbeddedWorkerRegistry::GetWorker(
   return found->second;
 }
 
-EmbeddedWorkerRegistry::~EmbeddedWorkerRegistry() {}
+EmbeddedWorkerRegistry::~EmbeddedWorkerRegistry() {
+  Shutdown();
+}
 
 ServiceWorkerStatusCode EmbeddedWorkerRegistry::Send(
     int process_id, IPC::Message* message) {