Add an experimental permissions API for extensions.

chrome/browser/background/background_mode_manager.cc

Index: chrome/browser/background/background_mode_manager.cc
diff --git a/chrome/browser/background/background_mode_manager.cc b/chrome/browser/background/background_mode_manager.cc
index c44362c79f7c99dba7c42d0b80cebd49336c39ca..33eecf1f77d12ee429efce3159281f9b96f56139 100644
--- a/chrome/browser/background/background_mode_manager.cc
+++ b/chrome/browser/background/background_mode_manager.cc
@@ -196,13 +196,15 @@ void BackgroundModeManager::RegisterProfile(Profile* profile) {
                                                 profile, this));
   background_mode_data_[profile] = bmd;
 
-  // Listen for when extensions are loaded/unloaded so we can track the
-  // number of background apps and modify our keep-alive and launch-on-startup
-  // state appropriately.
+  // Listen for when extensions are loaded/unloaded or add/remove the
+  // background permission so we can track the number of background apps and
+  // modify our keep-alive and launch-on-startup state appropriately.
   registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_LOADED,
                  Source<Profile>(profile));
   registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UNLOADED,
                  Source<Profile>(profile));
+  registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_PERMISSIONS_UPDATED,
+                 Source<Profile>(profile));
 
   // Check for the presence of background apps after all extensions have been
   // loaded, to handle the case where an extension has been manually removed
@@ -274,6 +276,22 @@ void BackgroundModeManager::Observe(int type,
         OnBackgroundAppUninstalled();
       }
       break;
+    case chrome::NOTIFICATION_EXTENSION_PERMISSIONS_UPDATED: {
+        UpdatedExtensionPermissionsInfo* info =
+            Details<UpdatedExtensionPermissionsInfo>(details).ptr();
+        if (!info->permissions->HasAPIPermission(
+                ExtensionAPIPermission::kBackground))
+          break;
+
+        if (info->reason == UpdatedExtensionPermissionsInfo::ADDED) {
+          OnBackgroundAppInstalled(info->extension);
+          OnBackgroundAppLoaded();
+        } else {
+          OnBackgroundAppUnloaded();
+          OnBackgroundAppUninstalled();
+        }
+      }
+      break;
     case content::NOTIFICATION_APP_TERMINATING:
       // Make sure we aren't still keeping the app alive (only happens if we
       // don't receive an EXTENSIONS_READY notification for some reason).