aaudio: add MediaMetrics for MMAP streams

Log events from service.
Log start, stop, disconnect and other events.
Log underruns and bufferSize.

Bug: 154543374
Test: adb shell dumpsys media.metrics --clear
Test: run an app that uses MMAP, like OboeTester
Test: adb shell dumpsys media.metrics
Test: Expect to see lots of "audio.stream" events.
Change-Id: I690e5226b695d53d038d644f4438c759e08f9fbb
diff --git a/media/libaaudio/src/legacy/AudioStreamTrack.cpp b/media/libaaudio/src/legacy/AudioStreamTrack.cpp
index 6da63e8..2bdc26b 100644
--- a/media/libaaudio/src/legacy/AudioStreamTrack.cpp
+++ b/media/libaaudio/src/legacy/AudioStreamTrack.cpp
@@ -181,6 +181,9 @@
         return AAudioConvert_androidToAAudioResult(status);
     }
 
+    mMetricsId = std::string(AMEDIAMETRICS_KEY_PREFIX_AUDIO_TRACK)
+            + std::to_string(mAudioTrack->getPortId());
+
     doSetVolume();
 
     // Get the actual values from the AudioTrack.
@@ -248,6 +251,7 @@
 aaudio_result_t AudioStreamTrack::release_l() {
     if (getState() != AAUDIO_STREAM_STATE_CLOSING) {
         mAudioTrack->removeAudioDeviceCallback(mDeviceCallback);
+        logBufferState();
         // TODO Investigate why clear() causes a hang in test_various.cpp
         // if I call close() from a data callback.
         // But the same thing in AudioRecord is OK!