Added MEDIA_INFO_VIDEO_RENDERING_START as an informational event

o MEDIA_INFO_VIDEO_RENDERING_START indicates that the player just pushed the very first video frame
  of a video source for rendering.

Change-Id: I32dad93990f5d48b70fc79d841ca3ce3b1af4027
related-to-bug: 6851811

Author: James Dong

api/current.txt

@@ -11395,6 +11395,7 @@ package android.media {
     field public static final int MEDIA_INFO_METADATA_UPDATE = 802; // 0x322
     field public static final int MEDIA_INFO_NOT_SEEKABLE = 801; // 0x321
     field public static final int MEDIA_INFO_UNKNOWN = 1; // 0x1
+    field public static final int MEDIA_INFO_VIDEO_RENDERING_START = 3; // 0x3
     field public static final int MEDIA_INFO_VIDEO_TRACK_LAGGING = 700; // 0x2bc
     field public static final java.lang.String MEDIA_MIMETYPE_TEXT_SUBRIP = "application/x-subrip";
     field public static final int VIDEO_SCALING_MODE_SCALE_TO_FIT = 1; // 0x1

media/java/android/media/MediaPlayer.java

@@ -2319,6 +2319,11 @@ public void setOnErrorListener(OnErrorListener listener)
      */
     public static final int MEDIA_INFO_STARTED_AS_NEXT = 2;
 
+    /** The player just pushed the very first video frame for rendering.
+     * @see android.media.MediaPlayer.OnInfoListener
+     */
+    public static final int MEDIA_INFO_VIDEO_RENDERING_START = 3;
+
     /** The video is too complex for the decoder: it can't decode frames fast
      *  enough. Possibly only the audio plays fine at this stage.
      * @see android.media.MediaPlayer.OnInfoListener
@@ -2374,6 +2379,7 @@ public interface OnInfoListener
          * <ul>
          * <li>{@link #MEDIA_INFO_UNKNOWN}
          * <li>{@link #MEDIA_INFO_VIDEO_TRACK_LAGGING}
+         * <li>{@link #MEDIA_INFO_VIDEO_RENDERING_START}
          * <li>{@link #MEDIA_INFO_BUFFERING_START}
          * <li>{@link #MEDIA_INFO_BUFFERING_END}
          * <li>{@link #MEDIA_INFO_BAD_INTERLEAVING}