Experiment for snapping PIP to closest edge.

Test: Enable in SysUI tuner, drag PIP.  This is only experimental to help
      figure out what UX we want to keep.

Change-Id: I0d6f2f0c5909d6a76aae4a8fb84c5076f6996fdd
diff --git a/services/core/java/com/android/server/wm/PinnedStackController.java b/services/core/java/com/android/server/wm/PinnedStackController.java
index faca8db..1ccf722 100644
--- a/services/core/java/com/android/server/wm/PinnedStackController.java
+++ b/services/core/java/com/android/server/wm/PinnedStackController.java
@@ -99,6 +99,13 @@
                 mInInteractiveMode = inInteractiveMode;
             });
         }
+
+        @Override
+        public void setSnapToEdge(final boolean snapToEdge) {
+            mHandler.post(() -> {
+                mSnapAlgorithm.setSnapToEdge(snapToEdge);
+            });
+        }
     }
 
     /**