Add additional fake task views on overview gesture completion.

Added motion pause listening to animate an additional fake task view on overview gestures in the sandbox.

Test: manual

Demo: https://drive.google.com/file/d/1EpewbIAxiMUEz0Fqdfbok5q9xpWS6NWz/view?usp=sharing
Change-Id: Ifd0aed0a2bbb3204ae32c833b8466952679700e3
diff --git a/src/com/android/launcher3/Utilities.java b/src/com/android/launcher3/Utilities.java
index 1e023df..5c2f35b 100644
--- a/src/com/android/launcher3/Utilities.java
+++ b/src/com/android/launcher3/Utilities.java
@@ -404,6 +404,11 @@
         return (size / densityRatio);
     }
 
+    /** Converts a dp value to pixels for the current device. */
+    public static int dpToPx(float dp) {
+        return (int) (dp * Resources.getSystem().getDisplayMetrics().density);
+    }
+
     public static int pxFromSp(float size, DisplayMetrics metrics) {
         return (int) Math.round(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,
                 size, metrics));