Adding a format device button to UI.

chrome/browser/resources/file_manager/js/mock_chrome.js

 // Copyright (c) 2011 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.
 
 /**
  * Mock out the chrome.fileBrowserPrivate API for use in the harness.
  */
 chrome.fileBrowserPrivate = {
 
   /**
@@ skipping 203 matching lines @@
       DIMENSIONS_LABEL: 'Dimensions',
       DIMENSIONS_FORMAT: '$1 x $2',
 
       EJECT_BUTTON: 'Eject',
       IMAGE_DIMENSIONS: 'Image Dimensions',
       VOLUME_LABEL: 'Volume Label',
       READ_ONLY: 'Read Only',
 
       MOUNT_ARCHIVE: 'Open archive',
       UNMOUNT_ARCHIVE: 'Close archive',
+      FORMAT_DEVICE: 'Format device',
 
       CONFIRM_OVERWRITE_FILE: 'A file named "$1" already exists. Do you want to replace it?',
       FILE_ALREADY_EXISTS: 'The file named "$1" already exists. Please choose a different name.',
       DIRECTORY_ALREADY_EXISTS: 'The directory named "$1" already exists. Please choose a different name.',
       ERROR_RENAMING: 'Unable to rename "$1": $2',
       RENAME_PROMPT: 'Enter a new name',
       RENAME_BUTTON_LABEL: 'Rename',
 
       ERROR_DELETING: 'Unable to delete "$1": $2',
       DELETE_BUTTON_LABEL: 'Delete',
@@ skipping 96 matching lines @@
 };
 
 chrome.fileBrowserHandler = {
   onExecute: {
     listeners_: [],
     addListener: function(listener) {
       chrome.fileBrowserHandler.onExecute.listeners_.push(listener);
     }
   }
 };