Add WorkerScriptLoaded message to support attaching DevTools while starting ServiceWorker.

content/common/service_worker/embedded_worker_messages.h

Index: content/common/service_worker/embedded_worker_messages.h
diff --git a/content/common/service_worker/embedded_worker_messages.h b/content/common/service_worker/embedded_worker_messages.h
index c130285f719aa291b6bbde64b1824393ba0fa06a..b31e63b086464b8cca3f47f044ca585dfabc92b3 100644
--- a/content/common/service_worker/embedded_worker_messages.h
+++ b/content/common/service_worker/embedded_worker_messages.h
@@ -44,6 +44,16 @@ IPC_MESSAGE_CONTROL1(EmbeddedWorkerMsg_StartWorker,
 IPC_MESSAGE_CONTROL1(EmbeddedWorkerMsg_StopWorker,
                      int /* embedded_worker_id */)
 
+// Renderer -> Browser message to indicate that the worker has loadedd the
+// script.
+IPC_MESSAGE_CONTROL1(EmbeddedWorkerHostMsg_WorkerScriptLoaded,
+                     int /* embedded_worker_id */)
+
+// Renderer -> Browser message to indicate that the worker has failed to load
+// the script.
+IPC_MESSAGE_CONTROL1(EmbeddedWorkerHostMsg_WorkerScriptLoadFailed,
+                     int /* embedded_worker_id */)
+
 // Renderer -> Browser message to indicate that the worker is started.
 IPC_MESSAGE_CONTROL2(EmbeddedWorkerHostMsg_WorkerStarted,
                      int /* thread_id */,