More fun with action bars and themes!

Fix bug 5144738 - Allow user to define pressed state asset for action
bar. Added android:actionBarItemBackground theme attribute. This
allows themes to define item pressed states for the action bar
independent of the standard selectableItemBackground.

Fix bug 5145416 - Custom view in action bar should use themed context
when inflating resource ID. Also applies to tab custom views.

Fix bug 5135550 - Tab divider height / Color should match spec. Added
actionBarDivider theme attribute. Similar to actionBarItemBackground
above, this allows apps to maintain proper contrast when the bar has a
different contrast profile than the rest of the activity.

Fix bug 5154778 - Theme.Holo.Light.DarkActionBar in themes.xml and
search_bar.xml are still referencing the deprecated title_bar_shadow
when we should be pointing to ab_solid_shadow_holo

Change-Id: I5ef0084de28a7c2d2fa02ae1752884feab0f8523