Makes windowmanager draw non-client area

components/mus/example/wm/non_client_frame_view_impl.h

+// 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.
+
+#ifndef COMPONENTS_MUS_EXAMPLE_WM_NON_CLIENT_FRAME_VIEW_IMPL_H_
+#define COMPONENTS_MUS_EXAMPLE_WM_NON_CLIENT_FRAME_VIEW_IMPL_H_
+
+#include "base/macros.h"
+#include "components/mus/public/cpp/window_observer.h"
+#include "ui/compositor/paint_cache.h"
+#include "ui/views/window/custom_frame_view.h"
+
+class NonClientFrameViewImpl : public views::CustomFrameView,
+                               public mus::WindowObserver {
+ public:
+  explicit NonClientFrameViewImpl(mus::Window* window);
+  ~NonClientFrameViewImpl() override;
+
+ private:
+  // CustomFrameView:
+  gfx::Rect GetBoundsForClientView() const override;
+  void OnPaint(gfx::Canvas* canvas) override;
+  void PaintChildren(const ui::PaintContext& context) override;
+
+  // mus::WindowObserver:
+  void OnWindowClientAreaChanged(mus::Window* window,
+                                 const gfx::Insets& old_client_area) override;
+  void OnWindowDestroyed(mus::Window* window) override;
+
+ private:
+  mus::Window* window_;
+  ui::PaintCache paint_cache_;
+
+  DISALLOW_COPY_AND_ASSIGN(NonClientFrameViewImpl);
+};
+
+#endif  // COMPONENTS_MUS_EXAMPLE_WM_NON_CLIENT_FRAME_VIEW_IMPL_H_