win: Fix black pixel artifact at right and bottom

ui/views/widget/desktop_aura/desktop_native_widget_aura.cc

Index: ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
diff --git a/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc b/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
index d49af384df846f9290e03ea62cfd802711d40d83..bf97b00d38ad93278c9f5e9485e95f7b63f24abd 100644
--- a/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
+++ b/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
@@ -535,7 +535,9 @@ void DesktopNativeWidgetAura::InitNativeWidget(
       GetWidget()->GetRootView()));
 }
 
-void DesktopNativeWidgetAura::OnWidgetInitDone() {}
+void DesktopNativeWidgetAura::OnWidgetInitDone() {
+  desktop_window_tree_host_->OnNativeWidgetInitDone();
+}
 
 NonClientFrameView* DesktopNativeWidgetAura::CreateNonClientFrameView() {
   return ShouldUseNativeFrame() ? new NativeFrameView(GetWidget()) : NULL;