Import Android SDK Platform P [4719250]

/google/data/ro/projects/android/fetch_artifact \
    --bid 4719250 \
    --target sdk_phone_armv7-win_sdk \
    sdk-repo-linux-sources-4719250.zip

AndroidVersion.ApiLevel has been modified to appear as 28

Change-Id: I9ec0a12c9251b8449dba0d86b0cfdbcca16b0a7c
diff --git a/android/media/AudioFocusRequest.java b/android/media/AudioFocusRequest.java
index 7104dad..fe89b89 100644
--- a/android/media/AudioFocusRequest.java
+++ b/android/media/AudioFocusRequest.java
@@ -19,6 +19,7 @@
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.annotation.SystemApi;
+import android.annotation.TestApi;
 import android.media.AudioManager.OnAudioFocusChangeListener;
 import android.os.Bundle;
 import android.os.Handler;
@@ -262,6 +263,7 @@
      * Returns the focus change listener set for this {@code AudioFocusRequest}.
      * @return null if no {@link AudioManager.OnAudioFocusChangeListener} was set.
      */
+    @TestApi
     public @Nullable OnAudioFocusChangeListener getOnAudioFocusChangeListener() {
         return mFocusListener;
     }