MediaMetrics: improve API coverage

Fix: 183239947
Fix: 184396557
Fix: 183240314
Fix: 183240275
Fix: 183240276
Fix: 183240126
Test: atest android.media.metrics.cts.MediaMetricsAtomTests
Change-Id: I849beed2483f746e9486d3cea0f7797b2c030f1c
2 files changed