Implement SyncFileSystemService::GetFileSyncStatus method

chrome/browser/sync_file_system/drive_file_sync_service.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/sync_file_system/drive_file_sync_service.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 341 matching lines @@
   processor->PrepareForProcessRemoteChange(
       remote_change.url,
       base::Bind(&DriveFileSyncService::DidPrepareForProcessRemoteChange,
                  AsWeakPtr(), base::Passed(&param)));
 }
 
 LocalChangeProcessor* DriveFileSyncService::GetLocalChangeProcessor() {
   return this;
 }
 
+bool DriveFileSyncService::IsConflicting(const fileapi::FileSystemURL& url) {
+  DriveMetadata metadata;
+  const fileapi::SyncStatusCode status =
+      metadata_store_->ReadEntry(url, &metadata);
+  if (status != fileapi::SYNC_STATUS_OK) {
+    DCHECK_EQ(fileapi::SYNC_DATABASE_ERROR_NOT_FOUND, status);
+    return false;
+  }
+  return metadata.conflicted();
+}
+
 void DriveFileSyncService::GetConflictFiles(
     const GURL& origin,
     const fileapi::SyncFileSetCallback& callback) {
   NOTIMPLEMENTED();
   callback.Run(fileapi::SYNC_STATUS_FAILED,
                fileapi::FileSystemURLSet());
 }
 
 void DriveFileSyncService::GetRemoteFileMetadata(
     const fileapi::FileSystemURL& url,
@@ skipping 957 matching lines @@
 fileapi::SyncStatusCode
 DriveFileSyncService::GDataErrorCodeToSyncStatusCodeWrapper(
     google_apis::GDataErrorCode error) const {
   fileapi::SyncStatusCode status = GDataErrorCodeToSyncStatusCode(error);
   if (status != fileapi::SYNC_STATUS_OK && !sync_client_->IsAuthenticated())
     return fileapi::SYNC_STATUS_AUTHENTICATION_FAILED;
   return status;
 }
 
 }  // namespace sync_file_system