Fix TTS regression, TTS#stop can result in #onDone callback.

Regressinon in the L, side effect of the rewrite. In pre-L android,
UtteranceProgressListener#onDone was called (but only if client
received UtteranceProgressListener#onStart for the utterance in progress)
after client called TextToSpeech#stop. This changeset reinstates
this behaviour.
+ Removed not used fallback callback

Bug: 16149006
Change-Id: I2eb5ede0abe6f5717b07f09adad861465575c238

core/java/android/speech/tts/ITextToSpeechCallback.aidl

@@ -42,13 +42,6 @@ oneway interface ITextToSpeechCallback {
      */
     void onStop(String utteranceId);
 
-    /**
-     * Tells the client that the synthesis failed, and fallback synthesis will be attempted.
-     *
-     * @param utteranceId Unique id identifying synthesis request.
-     */
-    void onFallback(String utteranceId);
-
     /**
      * Tells the client that the synthesis has failed.
      *

core/java/android/speech/tts/TextToSpeech.java

@@ -1945,14 +1945,12 @@ public class TextToSpeech {
 
         private final ITextToSpeechCallback.Stub mCallback = new ITextToSpeechCallback.Stub() {
             public void onStop(String utteranceId) throws RemoteException {
-                // do nothing
+                UtteranceProgressListener listener = mUtteranceProgressListener;
+                if (listener != null) {
+                    listener.onDone(utteranceId);
+                }
             };
 
-            @Override
-            public void onFallback(String utteranceId) throws RemoteException {
-                // do nothing
-            }
-
             @Override
             public void onSuccess(String utteranceId) {
                 UtteranceProgressListener listener = mUtteranceProgressListener;

core/java/android/speech/tts/TextToSpeechService.java

@@ -592,14 +592,12 @@ public abstract class TextToSpeechService extends Service {
     }
 
     interface UtteranceProgressDispatcher {
-        public void dispatchOnFallback();
         public void dispatchOnStop();
         public void dispatchOnSuccess();
         public void dispatchOnStart();
         public void dispatchOnError(int errorCode);
     }
 
-
     /** Set of parameters affecting audio output. */
     static class AudioOutputParams {
         /**
@@ -769,14 +767,6 @@ public abstract class TextToSpeechService extends Service {
             }
         }
 
-        @Override
-        public void dispatchOnFallback() {
-            final String utteranceId = getUtteranceId();
-            if (utteranceId != null) {
-                mCallbacks.dispatchOnFallback(getCallerIdentity(), utteranceId);
-            }
-        }
-
         @Override
         public void dispatchOnStart() {
             final String utteranceId = getUtteranceId();
@@ -1336,16 +1326,6 @@ public abstract class TextToSpeechService extends Service {
             }
         }
 
-        public void dispatchOnFallback(Object callerIdentity, String utteranceId) {
-            ITextToSpeechCallback cb = getCallbackFor(callerIdentity);
-            if (cb == null) return;
-            try {
-                cb.onFallback(utteranceId);
-            } catch (RemoteException e) {
-                Log.e(TAG, "Callback onFallback failed: " + e);
-            }
-        }
-
         public void dispatchOnStop(Object callerIdentity, String utteranceId) {
             ITextToSpeechCallback cb = getCallbackFor(callerIdentity);
             if (cb == null) return;