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..d7abd9b02c106253ec89b4b55fae7efd5a2ccbff 100644
--- a/ui/views/widget/widget_delegate.cc
+++ b/ui/views/widget/widget_delegate.cc
@@ -150,6 +150,12 @@ void WidgetDelegate::GetHitTestMask(gfx::Path* mask) const {
   DCHECK(mask);
 }
 
+bool WidgetDelegate::ShouldDescendIntoChildForEventHandling(
+    gfx::NativeView child,
+    const gfx::Point& location) {
+  return true;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // WidgetDelegateView: