app_list: Fix shadow bleeds over launcher button and steals mouse events

ui/views/widget/widget.cc

Index: ui/views/widget/widget.cc
diff --git a/ui/views/widget/widget.cc b/ui/views/widget/widget.cc
index d010dfb95cf4d86996a4308a1f6023a74b8795fc..22a1dab7b940c1d839b8e4eccc17459331697520 100644
--- a/ui/views/widget/widget.cc
+++ b/ui/views/widget/widget.cc
@@ -1130,6 +1130,15 @@ InputMethod* Widget::GetInputMethodDirect() {
   return input_method_.get();
 }
 
+bool Widget::HasHitTestMask() const {
+  return widget_delegate_->HasHitTestMask();
+}
+
+void Widget::GetHitTestMask(gfx::Path* mask) const {
+  DCHECK(mask);
+  widget_delegate_->GetHitTestMask(mask);
+}
+
 Widget* Widget::AsWidget() {
   return this;
 }