Only block internal touchpad and allow external mice to continue working in maximize mode.

ash/ash.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/chrome',
   },
   'includes': [
@@ skipping 556 matching lines @@
         'wm/gestures/shelf_gesture_handler.h',
         'wm/gestures/tray_gesture_handler.cc',
         'wm/gestures/tray_gesture_handler.h',
         'wm/immersive_fullscreen_controller.cc',
         'wm/immersive_fullscreen_controller.h',
         'wm/immersive_revealed_lock.cc',
         'wm/immersive_revealed_lock.h',
         'wm/lock_state_controller.cc',
         'wm/lock_state_controller.h',
         'wm/lock_state_observer.h',
+        'wm/maximize_mode/internal_input_device_list.h',
+        'wm/maximize_mode/internal_input_device_list_x11.cc',
+        'wm/maximize_mode/internal_input_device_list_x11.h',
         'wm/maximize_mode/maximize_mode_controller.cc',
         'wm/maximize_mode/maximize_mode_controller.h',
         'wm/maximize_mode/maximize_mode_event_blocker.cc',
         'wm/maximize_mode/maximize_mode_event_blocker.h',
         'wm/maximize_mode/maximize_mode_window_manager.cc',
         'wm/maximize_mode/maximize_mode_window_manager.h',
         'wm/maximize_mode/maximize_mode_window_state.cc',
         'wm/maximize_mode/maximize_mode_window_state.h',
         'wm/maximize_mode/workspace_backdrop_delegate.cc',
         'wm/maximize_mode/workspace_backdrop_delegate.h',
@@ skipping 627 matching lines @@
       'conditions': [
         ['chromeos==1', {
           'dependencies': [
             '../ui/display/display.gyp:display',
           ],
         }],
       ],
     },
   ],
 }