drive: Add showroot=true to WAPI feed URLs and ignore "no parent" entries.

chrome/browser/chromeos/drive/resource_entry_conversion.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/chromeos/drive/resource_entry_conversion.h"
 
 #include <string>
 
 #include "base/logging.h"
 #include "base/string_util.h"
@@ skipping 21 matching lines @@
   entry_proto.set_download_url(entry.download_url().spec());
 
   const google_apis::Link* edit_link =
       entry.GetLinkByType(google_apis::Link::LINK_EDIT);
   if (edit_link)
     entry_proto.set_edit_url(edit_link->href().spec());
 
   const google_apis::Link* parent_link =
       entry.GetLinkByType(google_apis::Link::LINK_PARENT);
   if (parent_link) {
+    // TODO(haruki): Apply mapping from an empty parent to special dummy
+    // directory. See http://crbug.com/174233. Until we implement it,
+    // ChangeListProcessor ignores such "no parent" entries.
     entry_proto.set_parent_resource_id(
         util::ExtractResourceIdFromUrl(parent_link->href()));
   }
 
   entry_proto.set_deleted(entry.deleted());
   entry_proto.set_kind(entry.kind());
 
   PlatformFileInfoProto* file_info = entry_proto.mutable_file_info();
 
   file_info->set_last_modified(entry.updated_time().ToInternalValue());
@@ skipping 55 matching lines @@
       entry_proto.set_upload_url(upload_link->href().spec());
   } else {
     // Some resource entries don't map into files (i.e. sites).
     return DriveEntryProto();
   }
 
   return entry_proto;
 }
 
 }  // namespace drive