Wires up immersive mode for chrome and mash

ui/views/mus/native_widget_mus.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 "ui/views/mus/native_widget_mus.h"
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ skipping 1065 matching lines @@
 
 void NativeWidgetMus::Restore() {
   SetShowState(ui::mojom::ShowState::NORMAL);
 }
 
 void NativeWidgetMus::SetFullscreen(bool fullscreen) {
   if (IsFullscreen() == fullscreen)
     return;
   if (fullscreen) {
     show_state_before_fullscreen_ = GetShowState(window_);
-    // TODO(markdittmer): Fullscreen not implemented in ui::Window.
+    SetShowState(ui::mojom::ShowState::FULLSCREEN);
   } else {
     switch (show_state_before_fullscreen_) {
       case ui::mojom::ShowState::MAXIMIZED:
         Maximize();
         break;
       case ui::mojom::ShowState::MINIMIZED:
         Minimize();
         break;
       case ui::mojom::ShowState::DEFAULT:
       case ui::mojom::ShowState::NORMAL:
@@ skipping 331 matching lines @@
 
   gfx::Path mask_path;
   native_widget_delegate_->GetHitTestMask(&mask_path);
   // TODO(jamescook): Use the full path for the mask.
   gfx::Rect mask_rect =
       gfx::ToEnclosingRect(gfx::SkRectToRectF(mask_path.getBounds()));
   window_->SetHitTestMask(mask_rect);
 }
 
 }  // namespace views