Track volume should be maintained even if track is restored

If track is restored when it set its volume to a non-unity value (such as mute),
the volume was forced to unity again.  Now, the previous volume is restored.

Bug: 18570664
Change-Id: I79f34c6c7d6f535baba813fd3b8ba8e55cac8ad7
diff --git a/media/libmedia/AudioTrack.cpp b/media/libmedia/AudioTrack.cpp
index 4a6df6d..e4c3c08 100644
--- a/media/libmedia/AudioTrack.cpp
+++ b/media/libmedia/AudioTrack.cpp
@@ -1226,7 +1226,11 @@
         mStaticProxy = new StaticAudioTrackClientProxy(cblk, buffers, frameCount, mFrameSizeAF);
         mProxy = mStaticProxy;
     }
-    mProxy->setVolumeLR(GAIN_MINIFLOAT_PACKED_UNITY);
+
+    mProxy->setVolumeLR(gain_minifloat_pack(
+            gain_from_float(mVolume[AUDIO_INTERLEAVE_LEFT]),
+            gain_from_float(mVolume[AUDIO_INTERLEAVE_RIGHT])));
+
     mProxy->setSendLevel(mSendLevel);
     mProxy->setSampleRate(mSampleRate);
     mProxy->setMinimum(mNotificationFramesAct);