base

Restore 4 classes that were accidentally deleted

Bug 11291911

These deleted classes were previously public APIs and so need to remain
in the build (but hidden) in order to keep existing apps working.
(Partially reverts Change-Id: I02549a71104b35d86d99058c71f43e054730ec7d)

Change-Id: I28e53b056f41e66645136f5e18fba2ff55a65fe5