Add VKEY_POWER to the POSIX KeyboardCode enum.

ui/base/keycodes/keyboard_code_conversion_x.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 "ui/base/keycodes/keyboard_code_conversion_x.h"
 
 #define XK_3270  // for XK_3270_BackTab
 #include <X11/keysym.h>
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
@@ skipping 370 matching lines @@
       return VKEY_MEDIA_PLAY_PAUSE;
     case XF86XK_Mail:
       return VKEY_MEDIA_LAUNCH_MAIL;
     case XF86XK_LaunchA:  // F3 on an Apple keyboard.
       return VKEY_MEDIA_LAUNCH_APP1;
     case XF86XK_LaunchB:  // F4 on an Apple keyboard.
     case XF86XK_Calculator:
       return VKEY_MEDIA_LAUNCH_APP2;
     case XF86XK_WLAN:
       return VKEY_WLAN;
+    case XF86XK_PowerOff:
+      return VKEY_POWER;
     case XF86XK_MonBrightnessDown:
       return VKEY_BRIGHTNESS_DOWN;
     case XF86XK_MonBrightnessUp:
       return VKEY_BRIGHTNESS_UP;
     case XF86XK_KbdBrightnessDown:
       return VKEY_KBD_BRIGHTNESS_DOWN;
     case XF86XK_KbdBrightnessUp:
       return VKEY_KBD_BRIGHTNESS_UP;
 
     // TODO(sad): some keycodes are still missing.
@@ skipping 336 matching lines @@
     case VKEY_MEDIA_PLAY_PAUSE:
       return XF86XK_AudioPlay;
     case VKEY_MEDIA_LAUNCH_MAIL:
       return XF86XK_Mail;
     case VKEY_MEDIA_LAUNCH_APP1:
       return XF86XK_LaunchA;
     case VKEY_MEDIA_LAUNCH_APP2:
       return XF86XK_LaunchB;
     case VKEY_WLAN:
       return XF86XK_WLAN;
+    case VKEY_POWER:
+      return XF86XK_PowerOff;
     case VKEY_BRIGHTNESS_DOWN:
       return XF86XK_MonBrightnessDown;
     case VKEY_BRIGHTNESS_UP:
       return XF86XK_MonBrightnessUp;
     case VKEY_KBD_BRIGHTNESS_DOWN:
       return XF86XK_KbdBrightnessDown;
     case VKEY_KBD_BRIGHTNESS_UP:
       return XF86XK_KbdBrightnessUp;
 
     default:
       LOG(WARNING) << "Unknown keycode:" << keycode;
       return 0;
     }
 }
 
 }  // namespace ui