[OverlayWindow] Add platform-independent window and views implementation.

chrome/browser/ui/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/chromecast_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 769 matching lines @@
       "omnibox/alternate_nav_infobar_delegate.cc",
       "omnibox/alternate_nav_infobar_delegate.h",
       "omnibox/chrome_omnibox_client.cc",
       "omnibox/chrome_omnibox_client.h",
       "omnibox/chrome_omnibox_edit_controller.cc",
       "omnibox/chrome_omnibox_edit_controller.h",
       "omnibox/chrome_omnibox_navigation_observer.cc",
       "omnibox/chrome_omnibox_navigation_observer.h",
       "omnibox/clipboard_utils.cc",
       "omnibox/clipboard_utils.h",
+      "overlay/overlay_window.h",
       "page_info/page_info_infobar_delegate.cc",
       "page_info/page_info_infobar_delegate.h",
       "page_info/permission_menu_model.cc",
       "page_info/permission_menu_model.h",
       "passwords/manage_passwords_bubble_model.cc",
       "passwords/manage_passwords_bubble_model.h",
       "passwords/manage_passwords_icon_view.h",
       "passwords/manage_passwords_ui_controller.cc",
       "passwords/manage_passwords_ui_controller.h",
       "passwords/manage_passwords_view_utils_desktop.cc",
@@ skipping 743 matching lines @@
       "views/importer/import_lock_dialog_view.h",
       "views/location_bar/location_bar_bubble_delegate_view.cc",
       "views/location_bar/location_bar_bubble_delegate_view.h",
       "views/location_bar/zoom_bubble_view.cc",
       "views/location_bar/zoom_bubble_view.h",
       "views/login_handler_views.cc",
       "views/login_view.cc",
       "views/login_view.h",
       "views/new_back_shortcut_bubble.cc",
       "views/new_back_shortcut_bubble.h",
+      "views/overlay/overlay_window_views.cc",
+      "views/overlay/overlay_window_views.h",
       "views/page_info/chosen_object_row.cc",
       "views/page_info/chosen_object_row.h",
       "views/page_info/chosen_object_row_observer.h",
       "views/page_info/non_accessible_image_view.cc",
       "views/page_info/non_accessible_image_view.h",
       "views/page_info/page_info_bubble_view.cc",
       "views/page_info/page_info_bubble_view.h",
       "views/page_info/permission_selector_row.cc",
       "views/page_info/permission_selector_row.h",
       "views/page_info/permission_selector_row_observer.h",
@@ skipping 2119 matching lines @@
     deps += [
       "//chrome/test:test_support_ui",
       "//components/zoom",
     ]
   }
 
   if (enable_extensions) {
     deps += [ "//extensions/browser" ]
   }
 }