Updates shadow when active window changes

mash/wm/window_manager_application.cc

 // 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.
 
 #include "mash/wm/window_manager_application.h"
 
 #include "base/bind.h"
 #include "components/mus/common/util.h"
 #include "components/mus/public/cpp/event_matcher.h"
 #include "components/mus/public/cpp/window.h"
 #include "components/mus/public/cpp/window_tree_connection.h"
 #include "components/mus/public/cpp/window_tree_host_factory.h"
 #include "mash/wm/accelerator_registrar_impl.h"
 #include "mash/wm/background_layout.h"
+#include "mash/wm/shadow_controller.h"
 #include "mash/wm/shelf_layout.h"
 #include "mash/wm/window_layout.h"
 #include "mash/wm/window_manager_impl.h"
 #include "mojo/application/public/cpp/application_connection.h"
 #include "mojo/services/tracing/public/cpp/tracing_impl.h"
 #include "ui/mojo/init/ui_init.h"
 #include "ui/views/mus/aura_init.h"
 #include "ui/views/mus/display_converter.h"
 
 namespace mash {
@@ skipping 98 matching lines @@
 
   AddAccelerators();
 
   ui_init_.reset(new ui::mojo::UIInit(views::GetDisplaysFromWindow(root)));
   aura_init_.reset(new views::AuraInit(app_, "mash_wm_resources.pak"));
   window_manager_->Initialize(this);
 
   for (auto request : requests_)
     window_manager_binding_.AddBinding(window_manager_.get(), request->Pass());
   requests_.clear();
+
+  shadow_controller_.reset(new ShadowController(root->connection()));
 }
 
 void WindowManagerApplication::OnConnectionLost(
     mus::WindowTreeConnection* connection) {
   // TODO(sky): shutdown.
   NOTIMPLEMENTED();
+  shadow_controller_.reset();
 }
 
 void WindowManagerApplication::Create(
     mojo::ApplicationConnection* connection,
     mojo::InterfaceRequest<mus::mojom::AcceleratorRegistrar> request) {
   static int accelerator_registrar_count = 0;
   if (accelerator_registrar_count == std::numeric_limits<int>::max()) {
     // Restart from zero if we have reached the limit. It is technically
     // possible to end up with multiple active registrars with the same
     // namespace, but it is highly unlikely. In the event that multiple
@@ skipping 35 matching lines @@
     DCHECK_EQ(mus::LoWord(window->id()), container)
         << "Containers must be created before other windows!";
     window->SetBounds(root_->bounds());
     window->SetVisible(true);
     root_->AddChild(window);
   }
 }
 
 }  // namespace wm
 }  // namespace mash