drive: Add the local largest changestamp to chrome:drive-internals

chrome/browser/chromeos/drive/drive_file_system.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/drive_file_system.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/message_loop_proxy.h"
@@ skipping 2633 matching lines @@
 
   // Add the file to the cache if we have uploaded a new file.
   cache_->StoreOnUIThread(params.resource_id,
                           params.md5,
                           params.file_content_path,
                           DriveCache::FILE_OPERATION_MOVE,
                           base::Bind(&OnCacheUpdatedForAddUploadedFile,
                                      params.callback));
 }
 
+DriveFileSystemMetadata DriveFileSystem::GetMetadata() const {

[Zachary Kuznia, 2012/10/16 07:19:12]

Since you're only returning the largest changestamp, why not just add an
accessor for that field instead of the entire structure?

[satorux1, 2012/10/16 07:37:17]

I'm going to expose some more metadata shortly to chrome:drive-internals. :)

+  DriveFileSystemMetadata metadata;
+  metadata.largest_changestamp = resource_metadata_->largest_changestamp();
+  return metadata;
+}
+
 void DriveFileSystem::Observe(int type,
                               const content::NotificationSource& source,
                               const content::NotificationDetails& details) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   if (type == chrome::NOTIFICATION_PREF_CHANGED) {
     PrefService* pref_service = profile_->GetPrefs();
     std::string* pref_name = content::Details<std::string>(details).ptr();
     if (*pref_name == prefs::kDisableGDataHostedFiles) {
       SetHideHostedDocuments(
@@ skipping 349 matching lines @@
     return;
   }
 
   PlatformFileInfoProto entry_file_info;
   DriveEntry::ConvertPlatformFileInfoToProto(*file_info, &entry_file_info);
   *entry_proto->mutable_file_info() = entry_file_info;
   callback.Run(DRIVE_FILE_OK, entry_proto.Pass());
 }
 
 }  // namespace drive