Introduce AndroidFocusRules and NativeWidgetAndroid

ui/views/widget/native_widget_aura.h

Index: ui/views/widget/native_widget_aura.h
diff --git a/ui/views/widget/native_widget_aura.h b/ui/views/widget/native_widget_aura.h
index abe3a8a3d6f90d8c0e1a9f67b7440f3f7531acd0..8512f1b2248bf73ba72f2d679029436266b70502 100644
--- a/ui/views/widget/native_widget_aura.h
+++ b/ui/views/widget/native_widget_aura.h
@@ -41,8 +41,8 @@ class VIEWS_EXPORT NativeWidgetAura
  public:
   explicit NativeWidgetAura(internal::NativeWidgetDelegate* delegate);
 
-  // Called internally by NativeWidgetAura and DesktopNativeWidgetAura to
-  // associate |native_widget| with |window|.
+  // Called internally by NativeWidgetAura, NativeWidgetAndroid and
+  // DesktopNativeWidgetAura to associate |native_widget| with |window|.
   static void RegisterNativeWidgetForWindow(
       internal::NativeWidgetPrivate* native_widget,
       aura::Window* window);