Update current.txt with the changes in ag/1146522.

Change-Id: I8e82efbf99bf267125d4d3b2b21d53ca6656cc39
diff --git a/car-support-lib/api/current.txt b/car-support-lib/api/current.txt
index 0fa6988..f34dfb1 100644
--- a/car-support-lib/api/current.txt
+++ b/car-support-lib/api/current.txt
@@ -676,6 +676,7 @@
     method public abstract android.media.AudioFormat getAudioRecordAudioFormat();
     method public abstract int getAudioRecordMaxBufferSize();
     method public abstract int getAudioRecordMinBufferSize();
+    method public abstract boolean isMediaMuted() throws android.support.car.CarNotConnectedException;
     method public abstract int requestAudioFocus(android.media.AudioManager.OnAudioFocusChangeListener, android.media.AudioAttributes, int, int) throws java.lang.IllegalArgumentException;
     field public static final int CAR_AUDIO_USAGE_ALARM = 6; // 0x6
     field public static final int CAR_AUDIO_USAGE_DEFAULT = 0; // 0x0