Add a refresh button for providers which do not support watchers.

chrome/browser/chromeos/extensions/file_manager/private_api_misc.cc

 // Copyright 2013 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/chromeos/extensions/file_manager/private_api_misc.h"
 
 #include <set>
 #include <vector>
 
 #include "ash/frame/frame_util.h"
@@ skipping 418 matching lines @@
       service->GetProvidingExtensionInfoList();
 
   using api::file_manager_private::ProvidingExtension;
   std::vector<linked_ptr<ProvidingExtension>> providing_extensions;
   for (const auto& info : info_list) {
     const linked_ptr<ProvidingExtension> providing_extension(
         new ProvidingExtension);
     providing_extension->extension_id = info.extension_id;
     providing_extension->name = info.name;
     providing_extension->configurable = info.capabilities.configurable();
+    providing_extension->watchable = info.capabilities.watchable();
     providing_extension->multiple_mounts = info.capabilities.multiple_mounts();
     switch (info.capabilities.source()) {
       case SOURCE_FILE:
         providing_extension->source =
             api::manifest_types::FILE_SYSTEM_PROVIDER_SOURCE_FILE;
         break;
       case SOURCE_DEVICE:
         providing_extension->source =
             api::manifest_types::FILE_SYSTEM_PROVIDER_SOURCE_DEVICE;
         break;
@@ skipping 170 matching lines @@
     base::File::Error result) {
   if (result != base::File::FILE_OK) {
     Respond(Error("Failed to execute the action."));
     return;
   }
 
   Respond(NoArguments());
 }
 
 }  // namespace extensions