mash: Convert OnWindowInputEventAck to use an enum for handled status

components/mus/public/cpp/tests/test_window_tree.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/public/cpp/tests/test_window_tree.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mus {
 
@@ skipping 125 matching lines @@
                                          uint32_t window_id,
                                          mus::mojom::Cursor cursor_id) {}
 
 void TestWindowTree::SetWindowTextInputState(uint32_t window_id,
                                              mojo::TextInputStatePtr state) {}
 
 void TestWindowTree::SetImeVisibility(uint32_t window_id,
                                       bool visible,
                                       mojo::TextInputStatePtr state) {}
 
-void TestWindowTree::OnWindowInputEventAck(uint32_t event_id, bool handled) {
+void TestWindowTree::OnWindowInputEventAck(uint32_t event_id,
+                                           mus::mojom::EventResult result) {
   EXPECT_FALSE(acked_events_.count(event_id));
   acked_events_.insert(event_id);
 }
 
 void TestWindowTree::GetWindowManagerClient(
     mojo::AssociatedInterfaceRequest<mojom::WindowManagerClient> internal) {}
 
 }  // namespace mus