OverviewActions: Fix action buttons in place

Forcing OverviewActions buttons to appear as if it is shown only once in overview screen by overlapping all instances in the same spot.

Change-Id: I195d5455d5eb9f12a19c352169bc995849e59281
diff --git a/src/com/android/launcher3/PagedView.java b/src/com/android/launcher3/PagedView.java
index a1888bf..ae4eae9 100644
--- a/src/com/android/launcher3/PagedView.java
+++ b/src/com/android/launcher3/PagedView.java
@@ -245,6 +245,13 @@
         forceFinishScroller(true);
     }
 
+    /**
+     * Returns left offset of a page. This is the gap between pages and prevents overlap.
+     */
+    public int scrollOffsetLeft() {
+        return mInsets.left + getPaddingLeft();
+    }
+
     private void abortScrollerAnimation(boolean resetNextPage) {
         mScroller.abortAnimation();
         // We need to clean up the next page here to avoid computeScrollHelper from