Android template test apk for Audio Test Harness.

AudioTestHarnessTemplateAndroidTest class defines all the APIs that will
be executed by the actual AudioTestHarnessTemplateTest class.
If you wish to add coverage for certain Android APIs, this should be the
place to append.
Meanwhile AudioTestHarnessTemplateRunner class will extract all the test
methods defined in AudioTestHarnessTemplateAndroidTest class and add
them to the test suite.

Bug: 148106105
Test: This is an instrumentation test apk itself and it runs with the
test class defined in ag/10195888

Change-Id: I09ef70d468ed7c806e24916000a53f3bbf5bc6f3