Notifiy callers when a speech synthesis error occurs.

bug:5589877
Change-Id: Ideca8966ea1caa6789b3273e388dd1f25c1e2758
diff --git a/core/java/android/speech/tts/ITextToSpeechCallback.aidl b/core/java/android/speech/tts/ITextToSpeechCallback.aidl
index 40902ae..f0287d4 100755
--- a/core/java/android/speech/tts/ITextToSpeechCallback.aidl
+++ b/core/java/android/speech/tts/ITextToSpeechCallback.aidl
@@ -21,5 +21,7 @@
  * {@hide}
  */
 oneway interface ITextToSpeechCallback {
-    void utteranceCompleted(String utteranceId);
+    void onStart(String utteranceId);
+    void onDone(String utteranceId);
+    void onError(String utteranceId);
 }