More NativeWidget -> Widget notifications: visibility, minimize.

ui/views/cocoa/bridged_native_widget.h

Index: ui/views/cocoa/bridged_native_widget.h
diff --git a/ui/views/cocoa/bridged_native_widget.h b/ui/views/cocoa/bridged_native_widget.h
index 05eeabf92a4f2f6bbec9d4d6d62023d7847b1c7f..325dda00c349b3b52ab906bbc21f425669fa5a62 100644
--- a/ui/views/cocoa/bridged_native_widget.h
+++ b/ui/views/cocoa/bridged_native_widget.h
@@ -65,6 +65,11 @@ class VIEWS_EXPORT BridgedNativeWidget : public internal::InputMethodDelegate,
   // invert the value of target_fullscreen_state().
   void ToggleDesiredFullscreenState();
 
+  // Called by the NSWindowDelegate when the visibility of the window may have
+  // changed. For example, due to a (de)miniaturize operation, or the window
+  // being reordered in (or out of) the screen list.
+  void OnVisibilityChanged();
+
   // See widget.h for documentation.
   InputMethod* CreateInputMethod();
   ui::InputMethod* GetHostInputMethod();
@@ -106,6 +111,10 @@ class VIEWS_EXPORT BridgedNativeWidget : public internal::InputMethodDelegate,
   // can not currently be changed.
   bool in_fullscreen_transition_;
 
+  // Stores the value last read from -[NSWindow isVisible], to detect visibility
+  // changes.
+  bool window_visible_;
+
   // Overridden from FocusChangeListener:
   virtual void OnWillChangeFocus(View* focused_before,
                                  View* focused_now) override;