diff --git a/media/java/android/media/MediaCodec.java b/media/java/android/media/MediaCodec.java
index 822d22b072d6c..4968bd1e0ce75 100644
--- a/media/java/android/media/MediaCodec.java
+++ b/media/java/android/media/MediaCodec.java
@@ -1684,7 +1684,6 @@ final public class MediaCodec {
     private MediaCodecInfo mCodecInfo;
     private final Object mCodecInfoLock = new Object();
     private MediaCrypto mCrypto;
-    private String mPlaybackId;
 
     private static final int EVENT_CALLBACK = 1;
     private static final int EVENT_SET_CALLBACK = 2;
diff --git a/media/java/android/media/MediaFormat.java b/media/java/android/media/MediaFormat.java
index 2448d481af2e0..50a326e9a595d 100644
--- a/media/java/android/media/MediaFormat.java
+++ b/media/java/android/media/MediaFormat.java
@@ -218,6 +218,15 @@ public final class MediaFormat {
     @UnsupportedAppUsage
     private Map<String, Object> mMap;
 
+    /**
+     * A key describing the log session ID for MediaCodec. The log session ID is a random 32-byte
+     * hexadecimal string that is used to associate metrics from multiple media codec instances
+     * to the same playback or recording session.
+     * The associated value is a string.
+     * @hide
+     */
+    public static final String LOG_SESSION_ID = "log-session-id";
+
     /**
      * A key describing the mime type of the MediaFormat.
      * The associated value is a string.