Flag mouse messages received when cursor is hidden.

ui/views/corewm/tooltip_controller.cc

Index: ui/views/corewm/tooltip_controller.cc
diff --git a/ui/views/corewm/tooltip_controller.cc b/ui/views/corewm/tooltip_controller.cc
index 02cd71ac0ad1de86d15d5c94e8f65f839a3e7024..a33d8e08ed7f1205a37102a1a60d571ec1cef913 100644
--- a/ui/views/corewm/tooltip_controller.cc
+++ b/ui/views/corewm/tooltip_controller.cc
@@ -189,6 +189,15 @@ void TooltipController::OnMouseEvent(ui::MouseEvent* event) {
       UpdateIfRequired();
     return;
   }
+  // TODO: Wrap this up in the previous test.
+  if ((event->flags() & ui::EF_FROM_TOUCH) ||
+      (event->flags() & ui::EF_IS_SYNTHESIZED) ||
+      (event->flags() & ui::EF_CURSOR_HIDDEN)) {
+    SetTooltipWindow(nullptr);
+    if (tooltip_->IsVisible())
+      UpdateIfRequired();
+    return;
+  }
   switch (event->type()) {
     case ui::ET_MOUSE_CAPTURE_CHANGED:
     case ui::ET_MOUSE_EXITED: