ServiceWorker: Implement StartWorker by using mojo

content/browser/service_worker/embedded_worker_registry.h

Index: content/browser/service_worker/embedded_worker_registry.h
diff --git a/content/browser/service_worker/embedded_worker_registry.h b/content/browser/service_worker/embedded_worker_registry.h
index 8e83b1dabbfd5983cd038d4e62ddbbde1f8730e7..b0e06092268aef7535d088642ec845ad07bc62c0 100644
--- a/content/browser/service_worker/embedded_worker_registry.h
+++ b/content/browser/service_worker/embedded_worker_registry.h
@@ -114,10 +114,10 @@ class CONTENT_EXPORT EmbeddedWorkerRegistry
   FRIEND_TEST_ALL_PREFIXES(EmbeddedWorkerInstanceTest,
                            RemoveWorkerInSharedProcess);
 
-  typedef std::map<int, EmbeddedWorkerInstance*> WorkerInstanceMap;
-  typedef std::map<int, IPC::Sender*> ProcessToSenderMap;
-  typedef std::map<int, MessagePortMessageFilter*>
-      ProcessToMessagePortMessageFilterMap;
+  using WorkerInstanceMap = std::map<int, EmbeddedWorkerInstance*>;
+  using ProcessToSenderMap = std::map<int, IPC::Sender*>;
+  using ProcessToMessagePortMessageFilterMap =
+      std::map<int, MessagePortMessageFilter*>;
 
   EmbeddedWorkerRegistry(
       const base::WeakPtr<ServiceWorkerContextCore>& context,
@@ -126,6 +126,11 @@ class CONTENT_EXPORT EmbeddedWorkerRegistry
 
   ServiceWorkerStatusCode Send(int process_id, IPC::Message* message);
 
+  // Called when EmbeddedWorkerInstance gets ready for IPC. This function
+  // prepares a route to the child worker thread.
+  // TODO(shimazu): Remove this function once mojofication is completed.
+  ServiceWorkerStatusCode AddWorker(int process_id, int embedded_worker_id);
+
   // RemoveWorker is called when EmbeddedWorkerInstance is destructed.
   // |process_id| could be invalid (i.e. ChildProcessHost::kInvalidUniqueID)
   // if it's not running.