SW: Propagate errors/exceptions from service worker to browser

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 5367e68dbddf56122431768a7fae7d6db7d9dca8..9d1a1f3bcb14b740b3b38bc05ca6262ec1d57e43 100644
--- a/content/common/service_worker/embedded_worker_messages.h
+++ b/content/common/service_worker/embedded_worker_messages.h
@@ -35,13 +35,21 @@ IPC_MESSAGE_CONTROL2(EmbeddedWorkerHostMsg_WorkerStarted,
 IPC_MESSAGE_CONTROL1(EmbeddedWorkerHostMsg_WorkerStopped,
                      int /* embedded_worker_id */)
 
-// Renderer ->Browser message to send message.
+// Renderer -> Browser message to send message.
 // |request_id| might be used for bi-directional messaging.
 IPC_MESSAGE_CONTROL3(EmbeddedWorkerHostMsg_SendMessageToBrowser,
                      int /* embedded_worker_id */,
                      int /* request_id */,
                      IPC::Message /* message */)
 
+// Renderer -> Browser message to report an exception.
+IPC_MESSAGE_CONTROL5(EmbeddedWorkerHostMsg_ReportException,
+                     int /* embedded_worker_id */,
+                     base::string16 /* error_message */,
+                     int /* line_number */,
+                     int /* column_number */,
+                     GURL /* source_url */)
+
 // ---------------------------------------------------------------------------
 // For EmbeddedWorkerContext related messages, which are directly sent from
 // browser to the worker thread in the child process. We use a new message class