Service Worker: Migrate to version_uuid and surface ServiceWorker.id. (Blink 1/3)

Source/modules/serviceworkers/ServiceWorker.cpp

Index: Source/modules/serviceworkers/ServiceWorker.cpp
diff --git a/Source/modules/serviceworkers/ServiceWorker.cpp b/Source/modules/serviceworkers/ServiceWorker.cpp
index cdc4ba7921f3d6a9a3351df32a78aef2f408091c..900e254d776eb2a72abe39b88d2a4660da2c4f41 100644
--- a/Source/modules/serviceworkers/ServiceWorker.cpp
+++ b/Source/modules/serviceworkers/ServiceWorker.cpp
@@ -101,6 +101,11 @@ String ServiceWorker::state() const
     }
 }
 
+String ServiceWorker::id() const
+{
+    return m_outerWorker->id();
+}
+
 PassRefPtrWillBeRawPtr<ServiceWorker> ServiceWorker::from(ExecutionContext* executionContext, WebType* worker)
 {
     if (!worker)