simpleperf: build cts test running in app context.

When built for cts test, the test binary uses run-as to move itself
to the data directory of debuggable app 'com.android.simpleperf',
and run the tests in app context using run-as.

Bug: http://b/18790309
Test: run cts-tradefed, 'run everything -m CtsSimpleperfTestCase'.
Change-Id: I523470bb8062cb944b44dc6f264a8b1c14221b62
6 files changed