Wire FileSystemOperation::TouchFile to Drive.

chrome/browser/chromeos/gdata/drive_file_system_proxy.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_GDATA_DRIVE_FILE_SYSTEM_PROXY_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_DRIVE_FILE_SYSTEM_PROXY_H_
 
 #include "chrome/browser/chromeos/gdata/drive_file_system_interface.h"
 #include "chrome/browser/chromeos/gdata/gdata_errorcode.h"
 #include "webkit/chromeos/fileapi/remote_file_system_proxy.h"
@@ skipping 59 matching lines @@
   virtual void CreateWritableSnapshotFile(
       const fileapi::FileSystemURL& url,
       const fileapi::WritableSnapshotFile& callback) OVERRIDE;
   virtual void OpenFile(
       const fileapi::FileSystemURL& url,
       int file_flags,
       base::ProcessHandle peer_handle,
       const fileapi::FileSystemOperation::OpenFileCallback&
           callback) OVERRIDE;
   virtual void NotifyCloseFile(const fileapi::FileSystemURL& url) OVERRIDE;
-  // TODO(zelidrag): More methods to follow as we implement other parts of FSO.
+  virtual void TouchFile(
+      const fileapi::FileSystemURL& url,
+      const base::Time& last_access_time,
+      const base::Time& last_modified_time,
+      const fileapi::FileSystemOperation::StatusCallback& callback)
+          OVERRIDE;
 
  protected:
   virtual ~DriveFileSystemProxy();
 
  private:
   // Checks if a given |url| belongs to this file system. If it does,
   // the call will return true and fill in |file_path| with a file path of
   // a corresponding element within this file system.
   static bool ValidateUrl(const fileapi::FileSystemURL& url,
                           FilePath* file_path);
@@ skipping 92 matching lines @@
   // DriveFileSystem is owned by Profile, which outlives DriveFileSystemProxy,
   // which is owned by CrosMountPointProvider (i.e. by the time Profile is
   // removed, the file manager is already gone). Hence it's safe to use this as
   // a raw pointer.
   DriveFileSystemInterface* file_system_;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_DRIVE_FILE_SYSTEM_PROXY_H_