mash: Convert OnWindowInputEventAck to use an enum for handled status

ui/views/mus/platform_window_mus.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 "ui/views/mus/platform_window_mus.h"
 
 #include "build/build_config.h"
 #include "components/bitmap_uploader/bitmap_uploader.h"
 #include "components/mus/public/cpp/property_type_converters.h"
 #include "components/mus/public/cpp/window_property.h"
@@ skipping 205 matching lines @@
   delegate_->OnWindowStateChanged(state);
 }
 
 void PlatformWindowMus::OnRequestClose(mus::Window* window) {
   delegate_->OnCloseRequest();
 }
 
 void PlatformWindowMus::OnWindowInputEvent(
     mus::Window* view,
     const ui::Event& event,
-    std::unique_ptr<base::Callback<void(bool)>>* ack_callback) {
+    std::unique_ptr<base::Callback<void(mus::mojom::EventResult)>>*
+        ack_callback) {
   // It's possible dispatching the event will spin a nested message loop. Ack
   // the callback now, otherwise we appear unresponsive for the life of the
   // nested message loop.
-  (*ack_callback)->Run(true);
+  (*ack_callback)->Run(mus::mojom::EventResult::HANDLED);
   ack_callback->reset();
   // TODO(moshayedi): Avoid cloning after updating PlatformWindowDelegate to
   // accept constant pointers.
   delegate_->DispatchEvent(ui::Event::Clone(event).get());
 }
 
 }  // namespace views