Added a key to retrieve the rotation angle in MediaMetadataRetriever.java class

o related-to-bug: 6872687

Change-Id: I94569bb8357c39e8309974ede8284b33a996866c

Author: James Dong

api/current.txt

@@ -11341,6 +11341,7 @@ package android.media {
     field public static final int METADATA_KEY_NUM_TRACKS = 10; // 0xa
     field public static final int METADATA_KEY_TITLE = 7; // 0x7
     field public static final int METADATA_KEY_VIDEO_HEIGHT = 19; // 0x13
+    field public static final int METADATA_KEY_VIDEO_ROTATION = 24; // 0x18
     field public static final int METADATA_KEY_VIDEO_WIDTH = 18; // 0x12
     field public static final int METADATA_KEY_WRITER = 11; // 0xb
     field public static final int METADATA_KEY_YEAR = 8; // 0x8

media/java/android/media/MediaMetadataRetriever.java

@@ -483,5 +483,10 @@ protected void finalize() throws Throwable {
      * of 180 degrees will be retrieved as "-90.0000+180.0000", for instance.
      */
     public static final int METADATA_KEY_LOCATION        = 23;
+    /**
+     * This key retrieves the video rotation angle in degrees, if available.
+     * The video rotation angle may be 0, 90, 180, or 270 degrees.
+     */
+    public static final int METADATA_KEY_VIDEO_ROTATION = 24;
     // Add more here...
 }