Fixes problems with drawn state

components/mus/public/cpp/window.h

 // Copyright 2014 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 COMPONENTS_MUS_PUBLIC_CPP_WINDOW_H_
 #define COMPONENTS_MUS_PUBLIC_CPP_WINDOW_H_
 
 #include <stdint.h>
 #include <vector>
 
@@ skipping 235 matching lines @@
   void LocalRemoveTransientWindow(Window* transient_window);
   void LocalSetModal();
   // Returns true if the order actually changed.
   bool LocalReorder(Window* relative, mojom::OrderDirection direction);
   void LocalSetBounds(const gfx::Rect& old_bounds, const gfx::Rect& new_bounds);
   void LocalSetClientArea(
       const gfx::Insets& new_client_area,
       const std::vector<gfx::Rect>& additional_client_areas);
   void LocalSetViewportMetrics(const mojom::ViewportMetrics& old_metrics,
                                const mojom::ViewportMetrics& new_metrics);
-  void LocalSetDrawn(bool drawn);
+  void LocalSetParentDrawn(bool drawn);
   void LocalSetVisible(bool visible);
   void LocalSetPredefinedCursor(mojom::Cursor cursor_id);
   void LocalSetSharedProperty(const std::string& name,
                               const std::vector<uint8_t>* data);
 
   // Notifies this winodw that its stacking position has changed.
   void NotifyWindowStackingChanged();
   // Methods implementing visibility change notifications. See WindowObserver
   // for more details.
   void NotifyWindowVisibilityChanged(Window* target);
@@ skipping 42 matching lines @@
   std::vector<gfx::Rect> additional_client_areas_;
 
   mojom::ViewportMetricsPtr viewport_metrics_;
 
   bool visible_;
 
   mojom::Cursor cursor_id_;
 
   SharedProperties properties_;
 
-  // Drawn state is derived from the visible state and the parent's visible
-  // state. This field is only used if the window has no parent (eg it's a
-  // root).
-  bool drawn_;
+  // Drawn state of our parent. This is only meaningful for root Windows, in
+  // which the parent Window isn't exposed to the client.
+  bool parent_drawn_;
 
   // Value struct to keep the name and deallocator for this property.
   // Key cannot be used for this purpose because it can be char* or
   // WindowProperty<>.
   struct Value {
     const char* name;
     int64_t value;
     PropertyDeallocator deallocator;
   };
 
   std::map<const void*, Value> prop_map_;
 
   DISALLOW_COPY_AND_ASSIGN(Window);
 };
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_PUBLIC_CPP_WINDOW_H_