Add new action for launching the user's music player app.

android.intent.action.MUSIC_PLAYER

http://b/2237931
diff --git a/api/current.xml b/api/current.xml
index e123602..33a8020 100644
--- a/api/current.xml
+++ b/api/current.xml
@@ -130743,6 +130743,17 @@
  visibility="public"
 >
 </field>
+<field name="INTENT_ACTION_MUSIC_PLAYER"
+ type="java.lang.String"
+ transient="false"
+ volatile="false"
+ value="&quot;android.intent.action.MUSIC_PLAYER&quot;"
+ static="true"
+ final="true"
+ deprecated="not deprecated"
+ visibility="public"
+>
+</field>
 <field name="INTENT_ACTION_STILL_IMAGE_CAMERA"
  type="java.lang.String"
  transient="false"
diff --git a/core/java/android/provider/MediaStore.java b/core/java/android/provider/MediaStore.java
index 74a03da..dda9018 100644
--- a/core/java/android/provider/MediaStore.java
+++ b/core/java/android/provider/MediaStore.java
@@ -54,6 +54,13 @@
     private static final String CONTENT_AUTHORITY_SLASH = "content://" + AUTHORITY + "/";
 
     /**
+     * Activity Action: Launch a music player.
+     * The activity should be able to play, browse, or manipulate music files stored on the device.
+     */
+    @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
+    public static final String INTENT_ACTION_MUSIC_PLAYER = "android.intent.action.MUSIC_PLAYER";
+
+    /**
      * Activity Action: Perform a search for media.
      * Contains at least the {@link android.app.SearchManager#QUERY} extra.
      * May also contain any combination of the following extras: