Add information to EXTRA_AUDIO_INJECT_SOURCE

indicate the data for injection should be a URI to an audio resource.

Fixes: 186411622
Test: none
Change-Id: I70b650c8fb8fa6de648c03df3c5464a570222fee

core/java/android/speech/RecognizerIntent.java

@@ -43,7 +43,7 @@ public class RecognizerIntent {
 
     /**
      * The extra key used in an intent which is providing an already opened audio source for the
-     * RecognitionService to use.
+     * RecognitionService to use. Data should be a URI to an audio resource.
      */
     public static final String EXTRA_AUDIO_INJECT_SOURCE =
             "android.speech.extra.AUDIO_INJECT_SOURCE";