mash: Preliminary support for widget hit test masks

components/mus/ws/default_access_policy.cc

Index: components/mus/ws/default_access_policy.cc
diff --git a/components/mus/ws/default_access_policy.cc b/components/mus/ws/default_access_policy.cc
index c6fe681ec7bc93e629467493a61dfa044fdf5f8b..c158ddb1678e46cf5d0650563cb0c7a3730832ce 100644
--- a/components/mus/ws/default_access_policy.cc
+++ b/components/mus/ws/default_access_policy.cc
@@ -144,6 +144,11 @@ bool DefaultAccessPolicy::CanSetClientArea(const ServerWindow* window) const {
          delegate_->HasRootForAccessPolicy(window);
 }
 
+bool DefaultAccessPolicy::CanSetHitTestMask(const ServerWindow* window) const {
+  return WasCreatedByThisConnection(window) ||
+         delegate_->HasRootForAccessPolicy(window);
+}
+
 bool DefaultAccessPolicy::CanSetCursorProperties(
     const ServerWindow* window) const {
   return WasCreatedByThisConnection(window) ||