Implement SyncFileSystemService::GetFileSyncStatus method

chrome/browser/sync_file_system/drive_file_sync_service.cc

Index: chrome/browser/sync_file_system/drive_file_sync_service.cc
diff --git a/chrome/browser/sync_file_system/drive_file_sync_service.cc b/chrome/browser/sync_file_system/drive_file_sync_service.cc
index fa49969163c897d8a49f7d2b343360284b340161..71cdb1f2e0b8ab91dd8ddee4eb610e90e9034d64 100644
--- a/chrome/browser/sync_file_system/drive_file_sync_service.cc
+++ b/chrome/browser/sync_file_system/drive_file_sync_service.cc
@@ -359,6 +359,17 @@ 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) {