WIP: Eliminate event.target() usage from TrayEventFilter

ash/pointer_watcher_delegate_aura.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 "ash/pointer_watcher_delegate_aura.h"
 
 #include "ash/shell.h"
 #include "ui/aura/client/screen_position_client.h"
 #include "ui/aura/window.h"
 #include "ui/events/event.h"
 #include "ui/events/event_constants.h"
 #include "ui/gfx/geometry/point.h"
 #include "ui/views/pointer_watcher.h"
+#include "ui/views/widget/widget.h"
 
 namespace ash {
 
 PointerWatcherDelegateAura::PointerWatcherDelegateAura() {
   Shell::GetInstance()->AddPreTargetHandler(this);
 }
 
 PointerWatcherDelegateAura::~PointerWatcherDelegateAura() {
   Shell::GetInstance()->RemovePreTargetHandler(this);
 }
 
 void PointerWatcherDelegateAura::AddPointerWatcher(
     views::PointerWatcher* watcher) {
   pointer_watchers_.AddObserver(watcher);
 }
 
 void PointerWatcherDelegateAura::RemovePointerWatcher(
     views::PointerWatcher* watcher) {
   pointer_watchers_.RemoveObserver(watcher);
 }
 
 void PointerWatcherDelegateAura::OnMouseEvent(ui::MouseEvent* event) {
   if (event->type() == ui::ET_MOUSE_PRESSED)
     FOR_EACH_OBSERVER(views::PointerWatcher, pointer_watchers_,
-                      OnMousePressed(*event, GetLocationInScreen(*event)));
+                      OnMousePressed(*event, GetLocationInScreen(*event),
+                                     GetTargetWidget(*event)));
 }
 
 void PointerWatcherDelegateAura::OnTouchEvent(ui::TouchEvent* event) {
   if (event->type() == ui::ET_TOUCH_PRESSED)
     FOR_EACH_OBSERVER(views::PointerWatcher, pointer_watchers_,
-                      OnTouchPressed(*event, GetLocationInScreen(*event)));
+                      OnTouchPressed(*event, GetLocationInScreen(*event),
+                                     GetTargetWidget(*event)));
+}
+
+views::Widget* PointerWatcherDelegateAura::GetTargetWidget(
+    const ui::LocatedEvent& event) const {
+  aura::Window* window = static_cast<aura::Window*>(event.target());
+  return views::Widget::GetTopLevelWidgetForNativeView(window);
 }
 
 gfx::Point PointerWatcherDelegateAura::GetLocationInScreen(
     const ui::LocatedEvent& event) const {
   aura::Window* target = static_cast<aura::Window*>(event.target());
   gfx::Point location_in_screen = event.location();
   aura::client::GetScreenPositionClient(target->GetRootWindow())
       ->ConvertPointToScreen(target, &location_in_screen);
   return location_in_screen;
 }
 
 }  // namespace ash