Various improvements to the wifi display implementation.

Using a MediaPuller now, audio and video on their separate threads.
No more flushing the RTP stream on audio tracks, since it wastes too much
of a full size UDP packet.

Change-Id: I53346b4aea739c3142da13bd179428503a3c98b0
diff --git a/media/libmediaplayerservice/RemoteDisplay.cpp b/media/libmediaplayerservice/RemoteDisplay.cpp
index 5542bb5..5baa3ad 100644
--- a/media/libmediaplayerservice/RemoteDisplay.cpp
+++ b/media/libmediaplayerservice/RemoteDisplay.cpp
@@ -28,6 +28,7 @@
     : mLooper(new ALooper),
       mNetSession(new ANetworkSession),
       mSource(new WifiDisplaySource(mNetSession, client)) {
+    mLooper->setName("wfd_looper");
     mLooper->registerHandler(mSource);
 
     mNetSession->start();