Revert of Revert of views: Move TOOLKIT_VIEWS definition in //ui/views/ from root.

ui/app_list/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/ui.gni")
 import("//testing/test.gni")
 
 component("app_list") {
   sources = [
     "app_list_constants.cc",
@@ skipping 153 matching lines @@
       "views/start_page_view.h",
       "views/tile_item_view.cc",
       "views/tile_item_view.h",
       "views/top_icon_animation_view.cc",
       "views/top_icon_animation_view.h",
     ]
     deps += [
       "//ui/events",
       "//ui/views",
     ]
+
+    public_deps = [
+      "//ui/views",
+    ]
   }
 
   if (is_mac) {
     sources += [
       "cocoa/app_list_pager_view.h",
       "cocoa/app_list_pager_view.mm",
       "cocoa/app_list_view_controller.h",
       "cocoa/app_list_view_controller.mm",
       "cocoa/app_list_window_controller.h",
       "cocoa/app_list_window_controller.mm",
@@ skipping 135 matching lines @@
       "cocoa/app_list_view_controller_unittest.mm",
       "cocoa/app_list_window_controller_unittest.mm",
       "cocoa/apps_grid_controller_unittest.mm",
       "cocoa/apps_search_box_controller_unittest.mm",
       "cocoa/apps_search_results_controller_unittest.mm",
       "cocoa/test/apps_grid_controller_test_helper.h",
       "cocoa/test/apps_grid_controller_test_helper.mm",
     ]
   }
 }