Updates shadow when active window changes

mash/wm/BUILD.gn

 # Copyright 2015 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("//mojo/public/mojo_application.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//tools/grit/repack.gni")
 
 group("tests") {
@@ skipping 28 matching lines @@
     "frame/non_client_frame_view_mash.cc",
     "frame/non_client_frame_view_mash.h",
     "layout_manager.cc",
     "layout_manager.h",
     "non_client_frame_controller.cc",
     "non_client_frame_controller.h",
     "property_util.cc",
     "property_util.h",
     "shadow.cc",
     "shadow.h",
+    "shadow_controller.cc",
+    "shadow_controller.h",
     "shelf_layout.cc",
     "shelf_layout.h",
     "window_layout.cc",
     "window_layout.h",
     "window_manager_application.cc",
     "window_manager_application.h",
     "window_manager_impl.cc",
     "window_manager_impl.h",
   ]
 
@@ skipping 108 matching lines @@
     "//testing/gtest",
     "//third_party/mojo/src/mojo/edk/system",
     "//ui/base",
     "//ui/events",
     "//ui/gfx:test_support",
     "//ui/gfx/geometry",
     "//ui/mojo/geometry:interfaces",
     "//ui/mojo/geometry:util",
   ]
 }