Add an option to specify requested fields for fetching metadata.

chrome/browser/chromeos/extensions/file_manager/private_api_file_system.cc

 // Copyright 2013 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/extensions/file_manager/private_api_file_system.h"
 
 #include <sys/statvfs.h>
 #include <set>
 
 #include "base/memory/weak_ptr.h"
@@ skipping 584 matching lines @@
   DiskMountManager::GetInstance()->FormatMountedDevice(
       volume->mount_path().AsUTF8Unsafe());
   SendResponse(true);
   return true;
 }
 
 // Obtains file size of URL.
 void GetFileMetadataOnIOThread(
     scoped_refptr<storage::FileSystemContext> file_system_context,
     const FileSystemURL& url,
+    int fields,
     const storage::FileSystemOperation::GetMetadataCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   file_system_context->operation_runner()->GetMetadata(
-      url, base::Bind(&GetFileMetadataRespondOnUIThread, callback));
+      url, fields, base::Bind(&GetFileMetadataRespondOnUIThread, callback));
 }
 
 // Checks if the available space of the |path| is enough for required |bytes|.
 bool CheckLocalDiskSpaceOnIOThread(const base::FilePath& path, int64 bytes) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   return bytes <= base::SysInfo::AmountOfFreeDiskSpace(path) -
                       cryptohome::kMinFreeSpaceInBytes;
 }
 
 bool FileManagerPrivateInternalStartCopyFunction::RunAsync() {
@@ skipping 30 matching lines @@
     return false;
   }
 
   // Check if the destination directory is downloads. If so, secure available
   // spece by freeing drive caches.
   if (destination_url_.filesystem_id() ==
       file_manager::util::GetDownloadsMountPointName(GetProfile())) {
     return BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE,
         base::Bind(&GetFileMetadataOnIOThread, file_system_context, source_url_,
+                   storage::FileSystemOperation::GET_METADATA_FIELD_SIZE,
                    base::Bind(&FileManagerPrivateInternalStartCopyFunction::
                                   RunAfterGetFileMetadata,
                               this)));
   }
 
   return BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(
           &FileManagerPrivateInternalStartCopyFunction::RunAfterFreeDiskSpace,
           this, true));
@@ skipping 318 matching lines @@
   return RespondLater();
 }
 
 void FileManagerPrivateInternalSetEntryTagFunction::OnSetEntryPropertyCompleted(
     drive::FileError result) {
   Respond(result == drive::FILE_ERROR_OK ? NoArguments()
                                          : Error("Failed to set a tag."));
 }
 
 }  // namespace extensions