[Refactor] Replace kFullscreenUsesMinimalChromeKey with WindowState::hide_shelf_when_fullscreen()

ash/wm/window_state.h

Index: ash/wm/window_state.h
diff --git a/ash/wm/window_state.h b/ash/wm/window_state.h
index 8c68e2466b5116aa0bb965c1e2d9d99d9040ab3f..e5200cce5bc9f2fca328d2917d497b0780abcc87 100644
--- a/ash/wm/window_state.h
+++ b/ash/wm/window_state.h
@@ -58,6 +58,10 @@ class ASH_EXPORT WindowState : public aura::WindowObserver {
   bool IsMinimized() const;
   bool IsMaximized() const;
   bool IsFullscreen() const;
+  // True if the window's show state is SHOW_STATE_FULLSCREEN and the fullscreen
+  // type allows the top-of-window views to be revealed when the mouse is
+  // hovered at the top of the screen.
+  bool IsImmersiveFullscreen() const;
   bool IsMaximizedOrFullscreen() const;
   // True if the window's show state is SHOW_STATE_NORMAL or
   // SHOW_STATE_DEFAULT.
@@ -110,6 +114,13 @@ class ASH_EXPORT WindowState : public aura::WindowObserver {
   // Deletes and clears the restore bounds property on the window.
   void ClearRestoreBounds();
 
+  // Sets the type of fullscreen. This only has an effect if already in
+  // fullscreen.
+  FullscreenType fullscreen_type() const {
+    return fullscreen_type_;
+  }
+  void SetFullscreenType(FullscreenType type);
+
   // Sets whether the window should always be restored to the restore bounds
   // (sometimes the workspace layout manager restores the window to its original
   // bounds instead of the restore bounds. Setting this key overrides that
@@ -209,6 +220,7 @@ class ASH_EXPORT WindowState : public aura::WindowObserver {
   // The owner of this window settings.
   aura::Window* window_;
 
+  FullscreenType fullscreen_type_;
   bool tracked_by_workspace_;
   bool window_position_managed_;
   bool bounds_changed_by_user_;