Adding group divider support in Android Menus

Added a divider view in popup_menu_item_layout.
Hiding divider where they are not required in MenuAdapter.

Bug: 32172964
Test: Added test method testGroupDividerEnabledAPI to PopupMenuTest.java
Change-Id: I9cf0e9a72f085336e9f136a7ed17aead0e30760c