Further implementation for ToolbarActionBar

Integrate activity options menu and inline Toolbars. Fix a series of
small associated bugs.

Activities now (privately) offer several menu-related events directly
to the associated ActionBar. In the future this should help us
untangle some of the menu-based pasta in PhoneWindow.

Bug 15344598

Change-Id: I76211ad17d2bcbb58cf1d88914e855416d084ded