Add pointer id to the WebMouseEvent's constructors

ui/events/event.cc

Index: ui/events/event.cc
diff --git a/ui/events/event.cc b/ui/events/event.cc
index ce99ff82d68ee08dd10cdfe51f89c3bedfcfc56a..557c8943efa80ddabd1bdfee5ab576a3580708f1 100644
--- a/ui/events/event.cc
+++ b/ui/events/event.cc
@@ -532,7 +532,7 @@ PointerDetails::PointerDetails(EventPointerType pointer_type,
       id(pointer_id) {
   if (pointer_id == PointerDetails::kUnknownPointerId) {
     id = pointer_type == EventPointerType::POINTER_TYPE_MOUSE
-             ? MouseEvent::kMousePointerId
+             ? MouseEvent::kDefaultMousePointerId
              : 0;
   }
 }
@@ -757,7 +757,7 @@ void MouseEvent::SetClickCount(int click_count) {
   set_flags(f);
 }
 
-const int MouseEvent::kMousePointerId = std::numeric_limits<int32_t>::max();
+const int MouseEvent::kDefaultMousePointerId = std::numeric_limits<int>::max();
 
 ////////////////////////////////////////////////////////////////////////////////
 // MouseWheelEvent