Update ui::PointerEvent to support mouse wheel and capture change events.

ui/views/mus/pointer_watcher_event_router.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 "ui/views/mus/pointer_watcher_event_router.h"
 
 #include "services/ui/public/cpp/window.h"
 #include "services/ui/public/cpp/window_tree_client.h"
+#include "ui/display/screen.h"
 #include "ui/events/base_event_utils.h"
 #include "ui/events/event.h"
 #include "ui/views/mus/native_widget_mus.h"
 #include "ui/views/pointer_watcher.h"
 
 namespace views {
 namespace {
 
 bool HasPointerWatcher(
     base::ObserverList<views::PointerWatcher, true>* observer_list) {
@@ skipping 102 matching lines @@
 
   if (HasPointerWatcher(&non_move_watchers_))
     return EventTypes::NON_MOVE_EVENTS;
 
   return EventTypes::NONE;
 }
 
 void PointerWatcherEventRouter::OnWindowTreeCaptureChanged(
     ui::Window* gained_capture,
     ui::Window* lost_capture) {
-  FOR_EACH_OBSERVER(PointerWatcher, move_watchers_, OnMouseCaptureChanged());
+  const ui::MouseEvent mouse_event(ui::ET_MOUSE_CAPTURE_CHANGED, gfx::Point(),
+                                   gfx::Point(), ui::EventTimeForNow(), 0, 0);
+  const ui::PointerEvent event(mouse_event);
+  gfx::Point location_in_screen =
+      display::Screen::GetScreen()->GetCursorScreenPoint();
+  FOR_EACH_OBSERVER(PointerWatcher, move_watchers_,
+                    OnPointerEventObserved(event, location_in_screen, nullptr));
   FOR_EACH_OBSERVER(PointerWatcher, non_move_watchers_,
-                    OnMouseCaptureChanged());
+                    OnPointerEventObserved(event, location_in_screen, nullptr));
 }
 
 void PointerWatcherEventRouter::OnDidDestroyClient(
     ui::WindowTreeClient* client) {
   // We expect that all observers have been removed by this time.
   DCHECK_EQ(event_types_, EventTypes::NONE);
   DCHECK_EQ(client, window_tree_client_);
   window_tree_client_->RemoveObserver(this);
   window_tree_client_ = nullptr;
 }
 
 }  // namespace views