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/AudioPlaybackConfiguration.java b/android/media/AudioPlaybackConfiguration.java
index 8a36f91..7dfdb20 100644
--- a/android/media/AudioPlaybackConfiguration.java
+++ b/android/media/AudioPlaybackConfiguration.java
@@ -43,6 +43,8 @@
     /** @hide */
     public static final int PLAYER_PIID_INVALID = -1;
     /** @hide */
+    public static final int PLAYER_PIID_UNASSIGNED = 0;
+    /** @hide */
     public static final int PLAYER_UPID_INVALID = -1;
 
     // information about the implementation