Call FileSystem::TouchFile from FileSystemProxy.

chrome/browser/chromeos/drive/file_system_proxy.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/chromeos/drive/file_system_proxy.h"
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 602 matching lines @@
                                 file_path))));
 }
 
 void FileSystemProxy::TouchFile(
     const fileapi::FileSystemURL& url,
     const base::Time& last_access_time,
     const base::Time& last_modified_time,
     const FileSystemOperation::StatusCallback& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
-  // TODO(kinaba,kochi): crbug.com/144369. Support this operations once we have
-  // migrated to the new Drive API.
-  MessageLoopProxy::current()->PostTask(
-      FROM_HERE,
-      base::Bind(callback, base::PLATFORM_FILE_ERROR_INVALID_OPERATION));
+  base::FilePath file_path;
+  if (!ValidateUrl(url, &file_path))
+    return;
+
+  CallFileSystemMethodOnUIThread(
+      base::Bind(&FileSystemInterface::TouchFile,
+                 base::Unretained(file_system_),
+                 file_path, last_access_time, last_modified_time,
+                 google_apis::CreateRelayCallback(
+                     base::Bind(&FileSystemProxy::OnStatusCallback,
+                                this,
+                                callback))));
 }
 
 void FileSystemProxy::CreateSnapshotFile(
     const FileSystemURL& file_url,
     const FileSystemOperation::SnapshotFileCallback& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   base::FilePath file_path;
   if (!ValidateUrl(file_url, &file_path)) {
     MessageLoopProxy::current()->PostTask(
@@ skipping 220 matching lines @@
                      base::Bind(&EmitDebugLogForCloseFile,
                                 virtual_path))));
 }
 
 FileSystemInterface* FileSystemProxy::GetFileSystemOnUIThread() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   return file_system_;
 }
 
 }  // namespace drive