Add TEST_MAPPING files for AppSearch.

This replaces the previous @Presubmit solution.
This reverts commit 3638f66a5cd5b8d1797b88fd9da3bd482930bbce.

Bug: 143900788
Test: presubmit
Change-Id: I9dbb60166b958d492c309fa5ab402368bdbf7159
3 files changed