ServiceWorker: Add initial implementation of ExtendableMessageEvent behind a flag

content/browser/service_worker/service_worker_dispatcher_host.cc

Index: content/browser/service_worker/service_worker_dispatcher_host.cc
diff --git a/content/browser/service_worker/service_worker_dispatcher_host.cc b/content/browser/service_worker/service_worker_dispatcher_host.cc
index 78c54d198ea966458a5d26f83da0f7d685e5f476..0d16327cb92178a0933a1b75e9828d87fc99ff44 100644
--- a/content/browser/service_worker/service_worker_dispatcher_host.cc
+++ b/content/browser/service_worker/service_worker_dispatcher_host.cc
@@ -183,6 +183,8 @@ bool ServiceWorkerDispatcherHost::OnMessageReceived(
                         OnProviderDestroyed)
     IPC_MESSAGE_HANDLER(ServiceWorkerHostMsg_SetVersionId,
                         OnSetHostedVersionId)
+    IPC_MESSAGE_HANDLER(ServiceWorkerHostMsg_DeprecatedPostMessageToWorker,
+                        OnDeprecatedPostMessageToWorker)
     IPC_MESSAGE_HANDLER(ServiceWorkerHostMsg_PostMessageToWorker,
                         OnPostMessageToWorker)
     IPC_MESSAGE_HANDLER(EmbeddedWorkerHostMsg_WorkerReadyForInspection,
@@ -716,6 +718,26 @@ void ServiceWorkerDispatcherHost::OnPostMessageToWorker(
     return;
   }
 
+  handle->version()->DispatchExtendableMessageEvent(
+      message, sent_message_ports,
+      base::Bind(&ServiceWorkerUtils::NoOpStatusCallback));
+}
+
+void ServiceWorkerDispatcherHost::OnDeprecatedPostMessageToWorker(
+    int handle_id,
+    const base::string16& message,
+    const std::vector<TransferredMessagePort>& sent_message_ports) {
+  TRACE_EVENT0("ServiceWorker",
+               "ServiceWorkerDispatcherHost::OnDeprecatedPostMessageToWorker");
+  if (!GetContext())
+    return;
+
+  ServiceWorkerHandle* handle = handles_.Lookup(handle_id);
+  if (!handle) {
+    bad_message::ReceivedBadMessage(this, bad_message::SWDH_POST_MESSAGE);
+    return;
+  }
+
   handle->version()->DispatchMessageEvent(
       message, sent_message_ports,
       base::Bind(&ServiceWorkerUtils::NoOpStatusCallback));