OboeAudioService: add thread to service for passing timestamps

Cleanup several TODOs.

Test: test_aaudio in CTS
Change-Id: I7fc956b6a21cbb592f98e1e5a8f43ebd6926d796
Signed-off-by: Phil Burk <philburk@google.com>
diff --git a/media/liboboe/src/utility/AudioClock.h b/media/liboboe/src/utility/AudioClock.h
index 1a5c209..1779d8b 100644
--- a/media/liboboe/src/utility/AudioClock.h
+++ b/media/liboboe/src/utility/AudioClock.h
@@ -14,8 +14,8 @@
  * limitations under the License.
  */
 
-#ifndef UTILITY_AUDIOCLOCK_H
-#define UTILITY_AUDIOCLOCK_H
+#ifndef UTILITY_AUDIO_CLOCK_H
+#define UTILITY_AUDIO_CLOCK_H
 
 #include <stdint.h>
 #include <time.h>
@@ -95,4 +95,4 @@
 };
 
 
-#endif // UTILITY_AUDIOCLOCK_H
+#endif // UTILITY_AUDIO_CLOCK_H