Handle XI_Enter and XI_Leave events.

ui/events/x/events_x_utils.cc

Index: ui/events/x/events_x_utils.cc
diff --git a/ui/events/x/events_x_utils.cc b/ui/events/x/events_x_utils.cc
index 60ba15d057242882a68a34ce99d69abe556e09f0..bd84d1fd6cea53df788b3b007fdced0896d30b25 100644
--- a/ui/events/x/events_x_utils.cc
+++ b/ui/events/x/events_x_utils.cc
@@ -270,6 +270,10 @@ ui::EventType GetTouchEventType(const XEvent& xev) {
     case XI_DeviceChanged:
       // This can happen when --touch-devices flag is used.
       return ui::ET_UNKNOWN;
+    case XI_Leave:
+    case XI_Enter:
+      // We don't handle enter/leave but they're expected.

[sadrul, 2016/09/01 23:12:55]

We do handle these events though:
https://cs.chromium.org/chromium/src/ui/views/widget/desktop_aura/desktop_win...

I think we need to return after processing
XI_Leave/XI_Enter/XI_FocusIn/XI_FocusOut events in that function, in addition to
the change in this function. But include FocusIn/FocusOut here, and update the
comment?

[kylechar, 2016/09/06 17:29:57]

Done.

+      return ui::ET_UNKNOWN;
     default:
       NOTREACHED();
   }