Preserve hosted apps' background contents across reload

chrome/browser/background_contents_service.cc

 // 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.
 
 #include "chrome/browser/background_contents_service.h"
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
@@ skipping 95 matching lines @@
       BackgroundContentsShutdown(Details<BackgroundContents>(details).ptr());
       break;
     case NotificationType::BACKGROUND_CONTENTS_CLOSED:
       DCHECK(IsTracked(Details<BackgroundContents>(details).ptr()));
       UnregisterBackgroundContents(Details<BackgroundContents>(details).ptr());
       break;
     case NotificationType::BACKGROUND_CONTENTS_NAVIGATED:
       DCHECK(IsTracked(Details<BackgroundContents>(details).ptr()));
       RegisterBackgroundContents(Details<BackgroundContents>(details).ptr());
       break;
-    case NotificationType::EXTENSION_UNLOADED:
-      ShutdownAssociatedBackgroundContents(
-          ASCIIToUTF16(
-              Details<UnloadedExtensionInfo>(details)->extension->id()));
+   case NotificationType::EXTENSION_UNLOADED:
+      switch (Details<UnloadedExtensionInfo>(details)->reason) {
+        case UnloadedExtensionInfo::DISABLE:  // Intentionally fall through.
+        case UnloadedExtensionInfo::UNINSTALL:
+          ShutdownAssociatedBackgroundContents(
+              ASCIIToUTF16(
+                  Details<UnloadedExtensionInfo>(details)->extension->id()));
+          break;
+        case UnloadedExtensionInfo::UPDATE:
+          // Leave BackgroundContents in place
+          break;
+        default:
+          NOTREACHED();
+          ShutdownAssociatedBackgroundContents(
+              ASCIIToUTF16(
+                  Details<UnloadedExtensionInfo>(details)->extension->id()));
+          break;
+      }
       break;
     default:
       NOTREACHED();
       break;
   }
 }
 
 // Loads all background contents whose urls have been stored in prefs.
 void BackgroundContentsService::LoadBackgroundContentsFromPrefs(
     Profile* profile) {
@@ skipping 178 matching lines @@
     TabContents* new_contents,
     WindowOpenDisposition disposition,
     const gfx::Rect& initial_pos,
     bool user_gesture) {
   Browser* browser = BrowserList::GetLastActiveWithProfile(
       new_contents->profile());
   if (!browser)
     return;
   browser->AddTabContents(new_contents, disposition, initial_pos, user_gesture);
 }