NuPlayerRenderer: return current real time as render time for video frame when paused.

This allows video to display immediately during seeking in paused state.
Also fix some racing condition.

Bug: 19153026
Change-Id: I0d7a8981ca3c121f5dbc430c2c6d8b7522edc24a
diff --git a/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.h b/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.h
index 23907c8..98fc44d 100644
--- a/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.h
+++ b/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.h
@@ -212,7 +212,7 @@
     int64_t getRealTimeUs(int64_t mediaTimeUs, int64_t nowUs);
 
     void onDrainVideoQueue();
-    void postDrainVideoQueue();
+    void postDrainVideoQueue_l();
 
     void prepareForMediaRenderingStart();
     void notifyIfMediaRenderingStarted();