Generalize layer mirroring for phantom windows

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 440 matching lines @@
     "common/wm/default_window_resizer.h",
     "common/wm/dock/docked_window_layout_manager.cc",
     "common/wm/dock/docked_window_layout_manager.h",
     "common/wm/dock/docked_window_layout_manager_observer.h",
     "common/wm/dock/docked_window_resizer.cc",
     "common/wm/dock/docked_window_resizer.h",
     "common/wm/drag_details.cc",
     "common/wm/drag_details.h",
     "common/wm/focus_rules.cc",
     "common/wm/focus_rules.h",
-    "common/wm/forwarding_layer_delegate.cc",
-    "common/wm/forwarding_layer_delegate.h",
     "common/wm/fullscreen_window_finder.cc",
     "common/wm/fullscreen_window_finder.h",
     "common/wm/immersive_context_ash.cc",
     "common/wm/immersive_context_ash.h",
     "common/wm/lock_layout_manager.cc",
     "common/wm/lock_layout_manager.h",
     "common/wm/lock_state_observer.h",
     "common/wm/lock_window_state.cc",
     "common/wm/lock_window_state.h",
     "common/wm/maximize_mode/maximize_mode_controller.cc",
@@ skipping 1002 matching lines @@
   if (is_win) {
     configs -= [ "//build/config/win:console" ]
     configs += [ "//build/config/win:windowed" ]
     deps += [ "//sandbox" ]
   }
 
   if (is_chromeos) {
     deps += [ "//device/bluetooth" ]
   }
 }