Have LazyBackgroundTaskQueue notify consumers when the transient page fails to

chrome/browser/extensions/api/runtime/runtime_api.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/extensions/api/runtime/runtime_api.h"
 
 #include "chrome/common/extensions/extension.h"
 #include "chrome/browser/extensions/extension_event_router.h"
 #include "chrome/browser/extensions/extension_host.h"
 #include "chrome/browser/extensions/extension_process_manager.h"
 #include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/extensions/lazy_background_task_queue.h"
 #include "chrome/browser/profiles/profile.h"
 #include "googleurl/src/gurl.h"
 
 namespace {
 
 const char kOnInstalledEvent[] = "experimental.runtime.onInstalled";
 const char kNoBackgroundPageError[] = "You do not have a background page.";
+const char kPageLoadError[] = "Background page failed to load.";
 
 }
 
 namespace extensions {
 
 // static
 void RuntimeEventRouter::DispatchOnInstalledEvent(
     Profile* profile, const Extension* extension) {
   // Special case: normally, extensions add their own lazy event listeners.
   // However, since the extension has just been installed, it hasn't had a
@@ skipping 19 matching lines @@
            base::Bind(&RuntimeGetBackgroundPageFunction::OnPageLoaded,
                       this));
   } else {
     error_ = kNoBackgroundPageError;
     return false;
   }
 
   return true;
 }
 
-void RuntimeGetBackgroundPageFunction::OnPageLoaded(ExtensionHost*) {
-  SendResponse(true);
+void RuntimeGetBackgroundPageFunction::OnPageLoaded(ExtensionHost* host) {
+  if (host) {
+    SendResponse(true);
+  } else {
+    error_ = kPageLoadError;
+    SendResponse(false);
+  }
 }
 
 }   // namespace extensions