Wires up immersive mode for chrome and mash

chrome/browser/ui/views/frame/immersive_mode_controller_ash.h

 // Copyright 2012 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 CHROME_BROWSER_UI_VIEWS_FRAME_IMMERSIVE_MODE_CONTROLLER_ASH_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_IMMERSIVE_MODE_CONTROLLER_ASH_H_
 
 #include <memory>
 
 #include "ash/common/wm/window_state_observer.h"
 #include "ash/shared/immersive_fullscreen_controller.h"
 #include "ash/shared/immersive_fullscreen_controller_delegate.h"
 #include "base/macros.h"
 #include "chrome/browser/ui/views/frame/immersive_mode_controller.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace aura {
 class Window;
 }
 
+// See ash/mus/frame/README.md for description of how immersive mode works in
+// mash. This code works with both classic ash, and mash.
 class ImmersiveModeControllerAsh
     : public ImmersiveModeController,
       public ash::ImmersiveFullscreenControllerDelegate,
       public ash::wm::WindowStateObserver,
       public content::NotificationObserver {
  public:
   ImmersiveModeControllerAsh();
   ~ImmersiveModeControllerAsh() override;
 
   ash::ImmersiveFullscreenController* controller() { return controller_.get(); }
@@ skipping 17 matching lines @@
   // tab fullscreen.
   void EnableWindowObservers(bool enable);
 
   // Updates the browser root view's layout including window caption controls.
   void LayoutBrowserRootView();
 
   // Updates whether the tab strip is painted in a short "light bar" style.
   // Returns true if the visibility of the tab indicators has changed.
   bool UpdateTabIndicators();
 
+  // Used when running in mash to create |mash_reveal_widget_|. Does nothing
+  // if already null.
+  void CreateMashRevealWidget();
+
+  // Destroys |mash_reveal_widget_| if valid, does nothing otherwise.
+  void DestroyMashRevealWidget();
+
   // ImmersiveFullscreenController::Delegate overrides:
   void OnImmersiveRevealStarted() override;
   void OnImmersiveRevealEnded() override;
   void OnImmersiveFullscreenExited() override;
   void SetVisibleFraction(double visible_fraction) override;
   std::vector<gfx::Rect> GetVisibleBoundsInScreen() const override;
 
   // ash::wm::WindowStateObserver override:
   void OnPostWindowStateTypeChange(ash::wm::WindowState* window_state,
                                    ash::wm::WindowStateType old_type) override;
@@ skipping 20 matching lines @@
 
   // The current visible bounds of the find bar, in screen coordinates. This is
   // an empty rect if the find bar is not visible.
   gfx::Rect find_bar_visible_bounds_in_screen_;
 
   // The fraction of the TopContainerView's height which is visible. Zero when
   // the top-of-window views are not revealed regardless of
   // |use_tab_indicators_|.
   double visible_fraction_;
 
+  // When running in mash a widget is created to draw the top container. This
+  // widget does not actually contain the top container, it just renders it.
+  std::unique_ptr<views::Widget> mash_reveal_widget_;
+
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ImmersiveModeControllerAsh);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_IMMERSIVE_MODE_CONTROLLER_ASH_H_