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

mojo/converters/blink/blink_input_events_type_converters_unittest.cc

Index: mojo/converters/blink/blink_input_events_type_converters_unittest.cc
diff --git a/mojo/converters/blink/blink_input_events_type_converters_unittest.cc b/mojo/converters/blink/blink_input_events_type_converters_unittest.cc
index 40d9c021309da3372918175d73c019c13ae7389e..d00405496ef44055d40ce8cb0b9f23b01ffbb850 100644
--- a/mojo/converters/blink/blink_input_events_type_converters_unittest.cc
+++ b/mojo/converters/blink/blink_input_events_type_converters_unittest.cc
@@ -47,9 +47,10 @@ TEST(BlinkInputEventsConvertersTest, WheelEvent) {
       ui::MouseEvent(ui::ET_MOUSEWHEEL, gfx::Point(), gfx::Point(),
                      base::TimeTicks(), 0, 0),
       kDeltaX, kDeltaY);
+  ui::PointerEvent pointer_event(ui_event);
   const std::unique_ptr<blink::WebInputEvent> web_event(
       TypeConverter<std::unique_ptr<blink::WebInputEvent>, ui::Event>::Convert(
-          ui_event));
+          pointer_event));
   ASSERT_TRUE(web_event);
   ASSERT_EQ(blink::WebInputEvent::MouseWheel, web_event->type);
   ASSERT_EQ(0, web_event->modifiers);