Short term workaround to deal with calculation error caused by inverted matrix.

ui/base/events/event.cc

Index: ui/base/events/event.cc
diff --git a/ui/base/events/event.cc b/ui/base/events/event.cc
index dd0cb479a950a89a7ca149af1561ec8ef1b55371..288eab9de0b75236a9db82cc4846596d7343d183 100644
--- a/ui/base/events/event.cc
+++ b/ui/base/events/event.cc
@@ -274,8 +274,7 @@ void LocatedEvent::UpdateForRootTransform(
   root_transform.TransformPointReverse(p);
   // TODO(oshima): Translating a point using reversed matrix can
   // results in small error like 0 -> -0.01, whose floored value
-  // is -1 instead of 0. Investigate the best way to handle this,
-  // instead of just rounding it.
+  // is -1 instead of 0. crbug.com/222483.
   root_location_ = location_ = gfx::ToFlooredPoint(p.AsPointF());
 }