Wires up immersive mode for chrome and mash

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

Index: chrome/browser/ui/views/frame/immersive_mode_controller_ash.h
diff --git a/chrome/browser/ui/views/frame/immersive_mode_controller_ash.h b/chrome/browser/ui/views/frame/immersive_mode_controller_ash.h
index 599752410abc30f6c34a99a1ca67e1c5d9c9376d..076428bd892897dce1ec7a38307c1e0600882897 100644
--- a/chrome/browser/ui/views/frame/immersive_mode_controller_ash.h
+++ b/chrome/browser/ui/views/frame/immersive_mode_controller_ash.h
@@ -16,10 +16,6 @@
 #include "content/public/browser/notification_registrar.h"
 #include "ui/gfx/geometry/rect.h"
 
-namespace aura {
-class Window;
-}
-
 class ImmersiveModeControllerAsh

[James Cook, 2016/08/24 17:00:32]

I think the commentary from your CL description should live somewhere in the
code as comments. This feature is tricky. This might be a good place for it, or
in ImmersiveModeController.

[sky, 2016/08/24 19:23:29]

I went with a markdown file in ash/mus/frame for this. WDYT?

[James Cook, 2016/08/24 19:56:29]

I like it.

     : public ImmersiveModeController,
       public ash::ImmersiveFullscreenControllerDelegate,
@@ -57,6 +53,13 @@ class ImmersiveModeControllerAsh
   // 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;
@@ -77,7 +80,6 @@ class ImmersiveModeControllerAsh
 
   // Not owned.
   BrowserView* browser_view_;
-  aura::Window* native_window_;
 
   // True if the observers for window restore and entering / exiting tab
   // fullscreen are enabled.
@@ -97,6 +99,10 @@ class ImmersiveModeControllerAsh
   // |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);