mash: Fix create fullscreen widget

ui/views/mus/desktop_window_tree_host_mus.cc

 // Copyright 2016 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 "ui/views/mus/desktop_window_tree_host_mus.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 265 matching lines @@
   // |TYPE_WINDOW| and |TYPE_PANEL| are forced to transparent as otherwise the
   // window is opaque and the client decorations drawn by the window manager
   // would not be seen.
   const bool transparent =
       params.opacity == Widget::InitParams::TRANSLUCENT_WINDOW ||
       params.type == Widget::InitParams::TYPE_WINDOW ||
       params.type == Widget::InitParams::TYPE_PANEL;
   content_window->SetTransparent(transparent);
   window()->SetTransparent(transparent);
 
+  window()->SetProperty(aura::client::kShowStateKey, params.show_state);
+
   if (!params.bounds.IsEmpty())
     SetBoundsInDIP(params.bounds);
 
   cursor_manager_ = base::MakeUnique<wm::CursorManager>(
       base::MakeUnique<NativeCursorManagerMus>(window()));
   aura::client::SetCursorClient(window(), cursor_manager_.get());
   InitHost();
 
   NativeWidgetAura::SetShadowElevationFromInitParams(window(), params);
 
@@ skipping 500 matching lines @@
   }
   const gfx::Rect old_bounds_in_pixels = GetBoundsInPixels();
   WindowTreeHostMus::SetBoundsInPixels(final_bounds_in_pixels);
   if (old_bounds_in_pixels.size() != final_bounds_in_pixels.size()) {
     SendClientAreaToServer();
     SendHitTestMaskToServer();
   }
 }
 
 }  // namespace views