Emit performance results via Instrumentation.

As part of preparing to run these tests inside CrystalBall, start
emitting our detailed performance metrics via Instrumentation so
they can be picked up by infrastructure.

Bug: 153739991
Test: atest MediaProviderClientTests:com.android.providers.media.client.PerformanceTest
Change-Id: I5898c56b7588cf8bb731b5399e0bf91e3eeb96ab
2 files changed