Draggable region support for frameless app window on CrOS.

ui/views/widget/native_widget_aura.cc

Index: ui/views/widget/native_widget_aura.cc
diff --git a/ui/views/widget/native_widget_aura.cc b/ui/views/widget/native_widget_aura.cc
index fa5ee73435153f5ad777d550dad7bef87e13aa8a..12eeda3b461cf3b5ddaabda09b43f53eb593015f 100644
--- a/ui/views/widget/native_widget_aura.cc
+++ b/ui/views/widget/native_widget_aura.cc
@@ -761,6 +761,11 @@ int NativeWidgetAura::GetNonClientComponent(const gfx::Point& point) const {
 bool NativeWidgetAura::ShouldDescendIntoChildForEventHandling(
       aura::Window* child,
       const gfx::Point& location) {
+  views::WidgetDelegate* widget_delegate = GetWidget()->widget_delegate();
+  if (widget_delegate &&
+      !widget_delegate->ShouldDescendIntoChildForEventHandling(child, location))
+    return false;
+
   // Don't descend into |child| if there is a view with a Layer that contains
   // the point and is stacked above |child|s layer.
   typedef std::vector<ui::Layer*> Layers;