Set default language in new TTS clients.

A recent change altered semantics of getLanguage call to return client
language instead of service language. This solved problems
with interferences between two clients using different lanaguages.

This change created a bug - new TTS client instance have no language set.
Since reading user preferences requires additional permissions I've
added new tts service method - getClientDefaultLanguage that will return
user preferences.

I've also added new client method, getDefaultLanguage, that allow easy
access to this data.

Bug: 7666482
Change-Id: Ieb7d2ba3a99d20c513add97f054874720a1cd82e
diff --git a/core/java/android/speech/tts/TextToSpeechService.java b/core/java/android/speech/tts/TextToSpeechService.java
index 458350d..4054740 100644
--- a/core/java/android/speech/tts/TextToSpeechService.java
+++ b/core/java/android/speech/tts/TextToSpeechService.java
@@ -850,6 +850,11 @@
             return onGetLanguage();
         }
 
+        @Override
+        public String[] getClientDefaultLanguage() {
+            return getSettingsLocale();
+        }
+
         /*
          * If defaults are enforced, then no language is "available" except
          * perhaps the default language selected by the user.