Use MD-ash's auto hide behavior for arc++ windows.

components/exo/shell_surface.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 "components/exo/shell_surface.h"
 
 #include "ash/aura/wm_window_aura.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/wm/window_resizer.h"
 #include "ash/common/wm/window_state.h"
@@ skipping 32 matching lines @@
 
 // This is a struct for accelerator keys used to close ShellSurfaces.
 const struct Accelerator {
   ui::KeyboardCode keycode;
   int modifiers;
 } kCloseWindowAccelerators[] = {
     {ui::VKEY_W, ui::EF_CONTROL_DOWN},
     {ui::VKEY_W, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN},
     {ui::VKEY_F4, ui::EF_ALT_DOWN}};
 
+void UpdateShelfStateForFullscreenChange(views::Widget* widget) {
+  ash::wm::WindowState* window_state =
+      ash::wm::GetWindowState(widget->GetNativeWindow());
+  window_state->set_shelf_mode_in_fullscreen(
+      ash::wm::WindowState::SHELF_AUTO_HIDE_INVISIBLE);
+  ash::Shell::GetInstance()->UpdateShelfVisibility();
+}
+
 class CustomFrameView : public views::NonClientFrameView {
  public:
   explicit CustomFrameView(views::Widget* widget) : widget_(widget) {}
   ~CustomFrameView() override {}
 
   // Overridden from views::NonClientFrameView:
   gfx::Rect GetBoundsForClientView() const override { return bounds(); }
   gfx::Rect GetWindowBoundsForClientBounds(
       const gfx::Rect& client_bounds) const override {
     return client_bounds;
@@ skipping 48 matching lines @@
   ~CustomWindowStateDelegate() override {
     if (widget_)
       widget_->RemoveObserver(this);
   }
 
   // Overridden from ash::wm::WindowStateDelegate:
   bool ToggleFullscreen(ash::wm::WindowState* window_state) override {
     if (widget_) {
       bool enter_fullscreen = !window_state->IsFullscreen();
       widget_->SetFullscreen(enter_fullscreen);
+      UpdateShelfStateForFullscreenChange(widget_);
     }
     return true;
   }
 
   // Overridden from views::WidgetObserver:
   void OnWidgetDestroying(views::Widget* widget) override {
     widget_->RemoveObserver(this);
     widget_ = nullptr;
   }
 
@@ skipping 252 matching lines @@
 void ShellSurface::SetFullscreen(bool fullscreen) {
   TRACE_EVENT1("exo", "ShellSurface::SetFullscreen", "fullscreen", fullscreen);
 
   if (!widget_)
     CreateShellSurfaceWidget(ui::SHOW_STATE_FULLSCREEN);
 
   // Note: This will ask client to configure its surface even if fullscreen
   // state doesn't change.
   ScopedConfigure scoped_configure(this, true);
   widget_->SetFullscreen(fullscreen);
+  UpdateShelfStateForFullscreenChange(widget_);
 }
 
 void ShellSurface::SetPinned(bool pinned) {
   TRACE_EVENT1("exo", "ShellSurface::SetPinned", "pinned", pinned);
 
   if (!widget_)
     CreateShellSurfaceWidget(ui::SHOW_STATE_NORMAL);
 
   // Note: This will ask client to configure its surface even if pinned
   // state doesn't change.
@@ skipping 839 matching lines @@
       shadow_overlay_->layer()->Add(shadow->layer());
       window->AddChild(shadow_overlay_);
       shadow_overlay_->Show();
     }
     shadow_overlay_->SetBounds(shadow_bounds);
     shadow->SetContentBounds(gfx::Rect(shadow_bounds.size()));
   }
 }
 
 }  // namespace exo