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

ash/aura/pointer_watcher_adapter.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/aura/pointer_watcher_adapter.h"
 
 #include "ash/shell.h"
 #include "ui/aura/client/screen_position_client.h"
 #include "ui/aura/window.h"
+#include "ui/display/screen.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 {
 
 PointerWatcherAdapter::PointerWatcherAdapter() {
   Shell::GetInstance()->AddPreTargetHandler(this);
@@ skipping 16 matching lines @@
   }
 }
 
 void PointerWatcherAdapter::RemovePointerWatcher(
     views::PointerWatcher* watcher) {
   non_move_watchers_.RemoveObserver(watcher);
   move_watchers_.RemoveObserver(watcher);
 }
 
 void PointerWatcherAdapter::OnMouseEvent(ui::MouseEvent* event) {
-  if (event->type() == ui::ET_MOUSE_CAPTURE_CHANGED) {
-    FOR_EACH_OBSERVER(views::PointerWatcher, non_move_watchers_,
-                      OnMouseCaptureChanged());
-    FOR_EACH_OBSERVER(views::PointerWatcher, move_watchers_,
-                      OnMouseCaptureChanged());
-    return;
-  }
-
   // For compatibility with the mus version, don't send drags.
   if (event->type() != ui::ET_MOUSE_PRESSED &&
       event->type() != ui::ET_MOUSE_RELEASED &&
-      event->type() != ui::ET_MOUSE_MOVED)
+      event->type() != ui::ET_MOUSE_MOVED &&
+      event->type() != ui::ET_MOUSEWHEEL &&
+      event->type() != ui::ET_MOUSE_CAPTURE_CHANGED)
     return;
 
   DCHECK(ui::PointerEvent::CanConvertFrom(*event));
   NotifyWatchers(ui::PointerEvent(*event), *event);
 }
 
 void PointerWatcherAdapter::OnTouchEvent(ui::TouchEvent* event) {
   // For compatibility with the mus version, don't send drags.
   if (event->type() != ui::ET_TOUCH_PRESSED &&
       event->type() != ui::ET_TOUCH_RELEASED)
     return;
 
   DCHECK(ui::PointerEvent::CanConvertFrom(*event));
   NotifyWatchers(ui::PointerEvent(*event), *event);
 }
 
 gfx::Point PointerWatcherAdapter::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);
+  gfx::Point location_in_screen;
+  if (event.type() == ui::ET_MOUSE_CAPTURE_CHANGED) {
+    location_in_screen = display::Screen::GetScreen()->GetCursorScreenPoint();
+  } else {
+    aura::Window* target = static_cast<aura::Window*>(event.target());
+    location_in_screen = event.location();
+    aura::client::GetScreenPositionClient(target->GetRootWindow())
+        ->ConvertPointToScreen(target, &location_in_screen);
+  }
   return location_in_screen;
 }
 
 views::Widget* PointerWatcherAdapter::GetTargetWidget(
     const ui::LocatedEvent& event) const {
   aura::Window* window = static_cast<aura::Window*>(event.target());
   return views::Widget::GetTopLevelWidgetForNativeView(window);
 }
 
 void PointerWatcherAdapter::NotifyWatchers(
     const ui::PointerEvent& event,
     const ui::LocatedEvent& original_event) {
   const gfx::Point screen_location(GetLocationInScreen(original_event));
   views::Widget* target_widget = GetTargetWidget(original_event);
   FOR_EACH_OBSERVER(
       views::PointerWatcher, move_watchers_,
       OnPointerEventObserved(event, screen_location, target_widget));
   if (event.type() != ui::ET_POINTER_MOVED) {
     FOR_EACH_OBSERVER(
         views::PointerWatcher, non_move_watchers_,
         OnPointerEventObserved(event, screen_location, target_widget));
   }
 }
 
 }  // namespace ash