Add an option to specify requested fields for fetching metadata.

chrome/browser/media_galleries/fileapi/native_media_file_util.cc

Index: chrome/browser/media_galleries/fileapi/native_media_file_util.cc
diff --git a/chrome/browser/media_galleries/fileapi/native_media_file_util.cc b/chrome/browser/media_galleries/fileapi/native_media_file_util.cc
index 7be547d7146806f2b4ff034adb85ed5d55dbd0db..50a4286c3e3eb1a716bc50fe165b23fdc236fa88 100644
--- a/chrome/browser/media_galleries/fileapi/native_media_file_util.cc
+++ b/chrome/browser/media_galleries/fileapi/native_media_file_util.cc
@@ -167,6 +167,7 @@ void NativeMediaFileUtil::CreateDirectory(
 void NativeMediaFileUtil::GetFileInfo(
     scoped_ptr<storage::FileSystemOperationContext> context,
     const storage::FileSystemURL& url,
+    int /* fields */,
     const GetFileInfoCallback& callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
   storage::FileSystemOperationContext* context_ptr = context.get();