Report an error message when an update job results in an error.

chrome/common/render_messages_internal.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This header is meant to be included in multiple passes, hence no traditional
 // header guard.
 // See ipc_message_macros.h for explanation of the macros and passes.
 
 #include <map>
 #include <string>
@@ skipping 602 matching lines @@
                        std::vector<int> /* host_ids */,
                        appcache::EventID)
 
   // Notifies the renderer of an AppCache progress event.
   IPC_MESSAGE_CONTROL4(AppCacheMsg_ProgressEventRaised,
                        std::vector<int> /* host_ids */,
                        GURL /* url being processed */,
                        int /* total */,
                        int /* complete */)
 
+  // Notifies the renderer of an AppCache error event.
+  IPC_MESSAGE_CONTROL2(AppCacheMsg_ErrorEventRaised,
+                       std::vector<int> /* host_ids */,
+                       std::string /* error_message */)
+
   // Notifies the renderer of an AppCache logging message.
   IPC_MESSAGE_CONTROL3(AppCacheMsg_LogMessage,
                        int /* host_id */,
                        int /* log_level */,
                        std::string /* message */)
 
   // Notifies the renderer of the fact that AppCache access was blocked.
   IPC_MESSAGE_CONTROL2(AppCacheMsg_ContentBlocked,
                        int /* host_id */,
                        GURL /* manifest_url */)
@@ skipping 1842 matching lines @@
   IPC_MESSAGE_CONTROL2(ViewHostMsg_Geolocation_Resume,
                        int /* render_view_id */,
                        int /* bridge_id */)
 
   // Send the tree of accessibility data to the browser, where it's cached
   // in order to respond to OS accessibility queries immediately.
   IPC_MESSAGE_ROUTED1(ViewHostMsg_AccessibilityTree,
                       webkit_glue::WebAccessibility)
 
 IPC_END_MESSAGES(ViewHost)