Ignore long clicks triggered from the edge of screen.

Bug: 31572404
Change-Id: Ie531941669549ce84b92302b95be94555ee0bb73
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index 367cee4..2db3c89 100644
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -182,4 +182,6 @@
          also happens to equal 19dp-->
     <dimen name="deep_shortcuts_arrow_horizontal_offset">19dp</dimen>
 
+<!-- Touch handling -->
+    <dimen name="edge_of_screen_threshold">8dp</dimen>
 </resources>