views: Some more layer change, and add/update some tests for layers.

views/widget/native_widget_gtk.cc

Index: views/widget/native_widget_gtk.cc
diff --git a/views/widget/native_widget_gtk.cc b/views/widget/native_widget_gtk.cc
index a16034255e7d16cda9166d64fec3e812d1f0cadd..a3cc021dac13e2e71ff9663b90403ae2ff06946d 100644
--- a/views/widget/native_widget_gtk.cc
+++ b/views/widget/native_widget_gtk.cc
@@ -1206,15 +1206,6 @@ void NativeWidgetGtk::Hide() {
     gtk_widget_hide(widget_);
     if (widget_->window)
       gdk_window_lower(widget_->window);
-    // We're not calling OnNativeWidgetVisibilityChanged because it
-    // breaks the ability to refocus to FindBar. NativeControlGtk
-    // detaches the underlying gtk widget for optimization purpose
-    // when it becomes invisible, which in turn breaks SetNativeFocus
-    // because there is no gtk attached to NativeControlGtk. I'm not
-    // fixing that part because
-    // a) This is views/gtk only issue, which will be gone soon.
-    // b) Alternative fix, which we can modify animator to show it
-    // immediately, won't be necessary for non gtk implementation.
   }
 }
 
@@ -1825,6 +1816,7 @@ void NativeWidgetGtk::OnDestroyed(GObject *where_the_object_was) {
 }
 
 void NativeWidgetGtk::OnShow(GtkWidget* widget) {
+  delegate_->OnNativeWidgetVisibilityChanged(true);
 }
 
 void NativeWidgetGtk::OnMap(GtkWidget* widget) {
@@ -1841,6 +1833,7 @@ void NativeWidgetGtk::OnMap(GtkWidget* widget) {
 }
 
 void NativeWidgetGtk::OnHide(GtkWidget* widget) {
+  delegate_->OnNativeWidgetVisibilityChanged(false);
 }
 
 gboolean NativeWidgetGtk::OnWindowStateEvent(GtkWidget* widget,