Make sure DragLayer layout params are of the correct type

bug 18141419

Change-Id: I50695a62cf9e1f25c054ac2c7197cd056d54cfae
diff --git a/src/com/android/launcher3/InsettableFrameLayout.java b/src/com/android/launcher3/InsettableFrameLayout.java
index 1c3d5a1..7343bf6 100644
--- a/src/com/android/launcher3/InsettableFrameLayout.java
+++ b/src/com/android/launcher3/InsettableFrameLayout.java
@@ -63,7 +63,7 @@
         return new LayoutParams(p);
     }
 
-    class LayoutParams extends FrameLayout.LayoutParams {
+    public static class LayoutParams extends FrameLayout.LayoutParams {
         boolean ignoreInsets = false;
 
         public LayoutParams(Context c, AttributeSet attrs) {