NuPlayerRenderer: adjust delay of posting drain audio message based on playback rate.

Bug: 19196501
Change-Id: I2a98e877ed946e899af0974a0c2397c4146ce349
diff --git a/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp b/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp
index a2ec51c..827bdc1 100644
--- a/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp
+++ b/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp
@@ -312,6 +312,9 @@
                 int64_t delayUs =
                     mAudioSink->msecsPerFrame()
                         * numFramesPendingPlayout * 1000ll;
+                if (mPlaybackRate > 1.0f) {
+                    delayUs /= mPlaybackRate;
+                }
 
                 // Let's give it more data after about half that time
                 // has elapsed.