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..3b19c7ab64476fb4a31dde788ccc57f913d73cee 100644
--- a/ui/events/x/events_x_utils.cc
+++ b/ui/events/x/events_x_utils.cc
@@ -270,6 +270,12 @@ 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:
+    case XI_FocusIn:
+    case XI_FocusOut:
+      // These may be handled by the PlatformEventDispatcher directly.
+      return ui::ET_UNKNOWN;
     default:
       NOTREACHED();
   }