Adding some extra logging around draglayer alpha

Bug: 116853349
Change-Id: I8b7ddbfdd74ea422380097e62bea86e160c1651f
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 4b181d8..c5f593a 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -2286,6 +2286,8 @@
         writer.print(" mPendingRequestArgs=" + mPendingRequestArgs);
         writer.println(" mPendingActivityResult=" + mPendingActivityResult);
         writer.println(" mRotationHelper: " + mRotationHelper);
+        // Extra logging for b/116853349
+        mDragLayer.dumpAlpha(writer);
         dumpMisc(writer);
 
         try {