Need some keyboard shortcut for fullscreen: Shift-F4

chrome/browser/resources/chromeos/keyboard_overlay_data.js

 // 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.
 
 var keyboardOverlayData = {
   'inputMethodIdToOverlayId': {
     'm17n:ar:kbd': 'ar',
     'm17n:fa:isiri': 'ar',
     'm17n:hi:itrans': 'hi',
     'm17n:th:kesmanee': 'th',
@@ skipping 15803 matching lines @@
     'e<>CTRL': 'keyboardOverlayFocusAddressBarInSearchMode',
     'enter<>ALT': 'keyboardOverlayOpenAddressInNewTab',
     'enter<>CTRL': 'keyboardOverlayAddWwwAndComAndOpenAddress',
     'enter<>SHIFT': 'keyboardOverlayFindPreviousText',
     'esc<>SHIFT': 'keyboardOverlayTaskManager',
     'f<>ALT': 'keyboardOverlayShowWrenchMenu',
     'f<>CTRL': 'keyboardOverlayFindText',
     'forward<>CTRL': 'keyboardOverlayFocusNextPane',
     'maximize<>ALT': 'keyboardOverlaySwapPrimaryMonitor',
     'maximize<>CTRL': 'keyboardOverlayMirrorMonitors',
+    'maximize<>SHIFT': 'keyboardOverlayFullscreen',
     'g<>CTRL': 'keyboardOverlayFindTextAgain',
     'g<>CTRL<>SHIFT': 'keyboardOverlayFindPreviousText',
     'h<>CTRL': 'keyboardOverlayHistory',
     'i<>ALT<>SHIFT': 'keyboardOverlayReportIssue',
     'i<>CTRL<>SHIFT': 'keyboardOverlayDeveloperTools',
     'j<>CTRL': 'keyboardOverlayDownloads',
     'j<>CTRL<>SHIFT': 'keyboardOverlayJavascriptConsole',
     'k<>CTRL': 'keyboardOverlayFocusAddressBarInSearchMode',
     'l<>ALT<>SHIFT': 'keyboardOverlayFocusLauncher',
     'l<>CTRL': 'keyboardOverlayFocusAddressBar',
@@ skipping 34 matching lines @@
     'up<>ALT<>CTRL': 'keyboardOverlayHome',
     'v<>CTRL': 'keyboardOverlayPaste',
     'v<>CTRL<>SHIFT': 'keyboardOverlayPasteAsPlainText',
     'w<>CTRL': 'keyboardOverlayCloseTab',
     'w<>CTRL<>SHIFT': 'keyboardOverlayCloseWindow',
     'x<>CTRL': 'keyboardOverlayCut',
     'z<>ALT<>CTRL': 'keyboardOverlayToggleAccessibilityFeatures',
     'z<>CTRL': 'keyboardOverlayUndo'
   }
 };