Draggable region support for frameless app window on CrOS.

ui/views/widget/widget_delegate.cc

Index: ui/views/widget/widget_delegate.cc
diff --git a/ui/views/widget/widget_delegate.cc b/ui/views/widget/widget_delegate.cc
index a858c6300f6a132591820f263cbcc2038835e89d..2b7b46b09930c5d0cd853ec994d0e6d5edcd1134 100644
--- a/ui/views/widget/widget_delegate.cc
+++ b/ui/views/widget/widget_delegate.cc
@@ -150,6 +150,13 @@ void WidgetDelegate::GetHitTestMask(gfx::Path* mask) const {
   DCHECK(mask);
 }
 
+bool WidgetDelegate::ShouldDescendIntoChildForEventHandling(
+    aura::Window* child,
+    const gfx::Point& event_location,
+    ui::EventType event_type) {
+  return true;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // WidgetDelegateView: