Switch to new protocol for hybrid hotseat

- create predictor from items in bgModel instead of scanning views
- Launcher no longer checks for duplicates before sending pin/unpin events
- sending cached items from last prediction to reduce UI shuffle
- Switch to using UserCache to persist and read ComponentKey

Bug: 148814143
Bug: 156413231
Bug: 156200931
Change-Id: Ide6330bed8eb7f0c6fbec1d1ac21e7f67a9b2be2

src/com/android/launcher3/DropTarget.java

@@ -110,6 +110,18 @@ public interface DropTarget {
 
             return res;
         }
+
+
+        /**
+         * This is used to determine if an object is dropped at a different location than it was
+         * dragged from
+         */
+        public boolean isMoved() {
+            return dragInfo.cellX != originalDragInfo.cellX
+                    || dragInfo.cellY != originalDragInfo.cellY
+                    || dragInfo.screenId != originalDragInfo.screenId
+                    || dragInfo.container != originalDragInfo.container;
+        }
     }
 
     /**