Merge change 8130 into donut

* changes:
  Increase the volume of the AudioTrack instance used for the speech synthesis.

packages/TtsService/jni/android_tts_SynthProxy.cpp

@@ -149,6 +149,7 @@ class SynthProxyJniStorage {
               mAudioOut = NULL;
             } else {
               //LOGI("AudioTrack OK");
+              mAudioOut->setVolume(2.0f, 2.0f);
               mAudioOut->start();
               LOGV("AudioTrack started");
             }