Mark the multiwindow divider as a trusted overlay.

Having it be untrusted breaks the permissions granting dialog in
multiwindow mode.

Bug: 28828041
Change-Id: I9193dbce7315ebaa205673edd4f406d0b72665c8
diff --git a/services/inputflinger/InputWindow.cpp b/services/inputflinger/InputWindow.cpp
index 1b913c5..d7b514b 100644
--- a/services/inputflinger/InputWindow.cpp
+++ b/services/inputflinger/InputWindow.cpp
@@ -46,7 +46,8 @@
             || layoutParamsType == TYPE_MAGNIFICATION_OVERLAY
             || layoutParamsType == TYPE_STATUS_BAR
             || layoutParamsType == TYPE_NAVIGATION_BAR
-            || layoutParamsType == TYPE_SECURE_SYSTEM_OVERLAY;
+            || layoutParamsType == TYPE_SECURE_SYSTEM_OVERLAY
+            || layoutParamsType == TYPE_DOCK_DIVIDER;
 }
 
 bool InputWindowInfo::supportsSplitTouch() const {