Add an option to specify requested fields for fetching metadata.

chrome/browser/chromeos/file_manager/snapshot_manager.cc

 // Copyright 2014 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/file_manager/snapshot_manager.h"
 
 #include "base/bind.h"
 #include "base/sys_info.h"
 #include "chrome/browser/chromeos/file_manager/app_id.h"
 #include "chrome/browser/chromeos/file_manager/fileapi_util.h"
@@ skipping 43 matching lines @@
       callback);
 }
 
 // Part of ComputeSpaceNeedToBeFreed.
 void GetMetadataOnIOThread(const base::FilePath& path,
                            scoped_refptr<storage::FileSystemContext> context,
                            const storage::FileSystemURL& url,
                            const GetNecessaryFreeSpaceCallback& callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
   context->operation_runner()->GetMetadata(
-      url,
+      url, storage::FileSystemOperation::GET_METADATA_FIELD_SIZE,
       base::Bind(&ComputeSpaceNeedToBeFreedAfterGetMetadata, path, callback));
 }
 
 // Computes the size of space that need to be __additionally__ made available
 // in the |profile|'s data directory for taking the snapshot of |url|.
 // Returns 0 if no additional space is required, or -1 in the case of an error.
 void ComputeSpaceNeedToBeFreed(
     Profile* profile,
     scoped_refptr<storage::FileSystemContext> context,
     const storage::FileSystemURL& url,
@@ skipping 128 matching lines @@
   if (result != base::File::FILE_OK) {
     callback.Run(base::FilePath());
     return;
   }
 
   file_refs_.push_back(FileReferenceWithSizeInfo(file_ref, file_info.size));
   callback.Run(platform_path);
 }
 
 }  // namespace file_manager