ui: events: Add a class to hold common touch and stylus properties

ui/views/controls/scrollbar/base_scroll_bar_button.cc

Index: ui/views/controls/scrollbar/base_scroll_bar_button.cc
diff --git a/ui/views/controls/scrollbar/base_scroll_bar_button.cc b/ui/views/controls/scrollbar/base_scroll_bar_button.cc
index 54dbe7501ee01024757816a651bf9ceafcaddc79..0f4d5b452753db7325991371b90f76f0ac848e01 100644
--- a/ui/views/controls/scrollbar/base_scroll_bar_button.cc
+++ b/ui/views/controls/scrollbar/base_scroll_bar_button.cc
@@ -39,9 +39,10 @@ void BaseScrollBarButton::RepeaterNotifyClick() {
   // TODO(scottmg): Native is wrong: http://crbug.com/133312
   gfx::Point cursor_point =
       gfx::Screen::GetNativeScreen()->GetCursorScreenPoint();
-  ui::MouseEvent event(ui::ET_MOUSE_RELEASED, cursor_point, cursor_point,
-                       ui::EventTimeForNow(), ui::EF_LEFT_MOUSE_BUTTON,
-                       ui::EF_LEFT_MOUSE_BUTTON);
+  ui::MouseEvent event(
+      ui::ET_MOUSE_RELEASED, cursor_point, cursor_point, ui::EventTimeForNow(),
+      ui::EF_LEFT_MOUSE_BUTTON, ui::EF_LEFT_MOUSE_BUTTON,
+      ui::PointerEventDetails(ui::EventPointerType::POINTER_TYPE_MOUSE));
   Button::NotifyClick(event);
 }