Cleaning up PointerIdManager and add id re-mapping

components/test_runner/event_sender.cc

Index: components/test_runner/event_sender.cc
diff --git a/components/test_runner/event_sender.cc b/components/test_runner/event_sender.cc
index 2818b072e6708cc4ba23fd88ac432651d969db00..467ba4033f817d23a08d0811ecc86efe85af49f9 100644
--- a/components/test_runner/event_sender.cc
+++ b/components/test_runner/event_sender.cc
@@ -93,6 +93,7 @@ void InitMouseEvent(WebInputEvent::Type t,
   e->y = pos.y;
   e->globalX = pos.x;
   e->globalY = pos.y;
+  e->pointerType = blink::WebPointerProperties::PointerType::Mouse;
   e->timeStampSeconds = time_stamp;
   e->clickCount = click_count;
 }