[File Manager] Add/remove Google Drive folder in the open File Manager when Drive enabled/disabled …

chrome/browser/chromeos/extensions/file_browser_event_router.cc

Index: chrome/browser/chromeos/extensions/file_browser_event_router.cc
diff --git a/chrome/browser/chromeos/extensions/file_browser_event_router.cc b/chrome/browser/chromeos/extensions/file_browser_event_router.cc
index d8c7284eba5f588a3df37774f1f92490c3a76777..6ecebdfd6524d6e80a67d40a2c61a358c1460693 100644
--- a/chrome/browser/chromeos/extensions/file_browser_event_router.cc
+++ b/chrome/browser/chromeos/extensions/file_browser_event_router.cc
@@ -158,6 +158,7 @@ void FileBrowserEventRouter::ObserveFileSystemEvents() {
   pref_change_registrar_->Init(profile_->GetPrefs());
   pref_change_registrar_->Add(prefs::kDisableGDataOverCellular, this);
   pref_change_registrar_->Add(prefs::kDisableGDataHostedFiles, this);
+  pref_change_registrar_->Add(prefs::kDisableGData, this);
 }
 
 // File watch setup routines.
@@ -509,6 +510,10 @@ void FileBrowserEventRouter::DispatchMountCompletedEvent(
       mount_info_value->SetString("mountPath",
                                   "/" + relative_mount_path.value());
       relative_mount_path_set = true;
+    } else {
+      LOG(ERROR) << "Mount path is not accessible: " << mount_info.mount_path;
+      mount_info_value->SetString("status",
+          MountErrorToString(chromeos::MOUNT_ERROR_PATH_UNMOUNTED));
     }
   }