Mandoline: Support transforms and clipping of OOPIFs and events

components/mus/surfaces/surfaces_state.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/mus/surfaces/surfaces_state.h"
 
 namespace mus {
 
-SurfacesState::SurfacesState() : next_id_namespace_(1u) {}
+SurfacesState::SurfacesState()
+    : next_id_namespace_(1u),
+      hit_tester_(&manager_) {
+}
 
 SurfacesState::~SurfacesState() {}
 
 }  // namespace mus