views/mus: Add a test to verify that Widget receives events correctly.

components/mus/public/cpp/tests/window_tree_client_impl_private.cc

 // Copyright 2016 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/window_tree_client_impl_private.h"
 
 #include "components/mus/public/cpp/lib/window_tree_client_impl.h"
+#include "components/mus/public/cpp/window.h"
 #include "mojo/converters/geometry/geometry_type_converters.h"
+#include "mojo/converters/input_events/input_events_type_converters.h"
 
 namespace mus {
 
 WindowTreeClientImplPrivate::WindowTreeClientImplPrivate(
     WindowTreeClientImpl* tree_client_impl)
     : tree_client_impl_(tree_client_impl) {}
 
+WindowTreeClientImplPrivate::WindowTreeClientImplPrivate(Window* window)
+    : WindowTreeClientImplPrivate(window->tree_client()) {}
+
 WindowTreeClientImplPrivate::~WindowTreeClientImplPrivate() {}
 
 uint32_t WindowTreeClientImplPrivate::event_observer_id() {
   return tree_client_impl_->event_observer_id_;
 }
 
 void WindowTreeClientImplPrivate::OnEmbed(mojom::WindowTree* window_tree) {
   mojom::WindowDataPtr root_data(mojom::WindowData::New());
   root_data->parent_id = 0;
   root_data->window_id = 1;
   root_data->bounds = mojo::Rect::From(gfx::Rect());
   root_data->properties.SetToEmpty();
   root_data->visible = true;
   root_data->viewport_metrics = mojom::ViewportMetrics::New();
   root_data->viewport_metrics->size_in_pixels =
       mojo::Size::From(gfx::Size(1000, 1000));
   root_data->viewport_metrics->device_pixel_ratio = 1;
   tree_client_impl_->OnEmbedImpl(window_tree, 1, std::move(root_data), 0, true);
 }
 
+void WindowTreeClientImplPrivate::PretendReceiveEvent(Window* window,
+                                                      const ui::Event& event) {
+  const uint32_t event_id = 0u;
+  const uint32_t observer_id = 0u;
+  tree_client_impl_->OnWindowInputEvent(event_id, window->server_id(),
+                                        mojom::Event::From(event), observer_id);
+}
+
 }  // namespace mus