Split //ui/events/devices into two targets.

ash/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//ui/base/ui_features.gni")
 
 assert(use_aura)
@@ skipping 63 matching lines @@
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
   }
 
   if (use_x11) {
     configs += [
       "//build/config/linux:x11",
       "//build/config/linux:xfixes",
     ]
     deps += [
+      "//ui/events/devices/x11",
       "//ui/events/platform",
       "//ui/gfx/x",
     ]
   } else {
     sources -= [
       "host/ash_window_tree_host_x11.cc",
       "host/ash_window_tree_host_x11.h",
       "wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard_x11.cc",
       "wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard_x11.h",
     ]
@@ skipping 384 matching lines @@
     configs += [ "//build/config/win:windowed" ]
     deps += [ "//sandbox" ]
   }
 
   if (is_chromeos) {
     deps += [ "//device/bluetooth" ]
   }
 }
 # When adding support for isolates, please have a look at run-time dependencies
 # in the ash_unittests_run target in ash.gyp.