Updates shadow when active window changes

mash/wm/non_client_frame_controller.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/non_client_frame_controller.h"
 
 #include "components/mus/public/cpp/window.h"
 #include "components/mus/public/interfaces/window_tree_host.mojom.h"
 #include "mash/wm/frame/frame_border_hit_test_controller.h"
 #include "mash/wm/frame/move_event_handler.h"
@@ skipping 99 matching lines @@
     aura::Window* root_window = GetNativeView()->GetHost()->window();
     move_event_handler_.reset(new MoveEventHandler(window(), GetNativeView()));
     root_window->AddPreTargetHandler(move_event_handler_.get());
     return frame_view;
   }
   void InitNativeWidget(const views::Widget::InitParams& params) override {
     views::NativeWidgetMus::InitNativeWidget(params);
     aura::WindowTreeHost* window_tree_host = GetNativeView()->GetHost();
     // TODO(sky): shadow should be determined by window type.
     shadow_.reset(new Shadow);
-    shadow_->Init(Shadow::STYLE_ACTIVE);
+    shadow_->Init(Shadow::STYLE_INACTIVE);
+    SetShadow(window(), shadow_.get());
     ContentWindowLayoutManager* layout_manager = new ContentWindowLayoutManager(
         window_tree_host->window(), ShadowStyle::NORMAL, shadow_.get());
     window_tree_host->window()->SetLayoutManager(layout_manager);
     const int inset = Shadow::GetInteriorInsetForStyle(Shadow::STYLE_ACTIVE);
     window_tree_host->SetOutputSurfacePadding(
         gfx::Insets(inset, inset, inset, inset));
     window_tree_host->window()->layer()->Add(shadow_->layer());
     shadow_->layer()->parent()->StackAtBottom(shadow_->layer());
   }
   void CenterWindow(const gfx::Size& size) override {
@@ skipping 84 matching lines @@
     widget_->OnSizeConstraintsChanged();
 }
 
 void NonClientFrameController::OnWindowDestroyed(mus::Window* window) {
   window_->RemoveObserver(this);
   window_ = nullptr;
 }
 
 }  // namespace wm
 }  // namespace mash