After seeking display the first new video frame right away without concern for A/V sync. This looks much more responsive to the user.

Change-Id: Ifb1f8c91e95a5cafe30ae1035973316c210b98a5
related-to-bug: 3152363
diff --git a/media/libstagefright/AwesomePlayer.cpp b/media/libstagefright/AwesomePlayer.cpp
index 5c423c0..08cf515 100644
--- a/media/libstagefright/AwesomePlayer.cpp
+++ b/media/libstagefright/AwesomePlayer.cpp
@@ -1248,6 +1248,7 @@
         mVideoTimeUs = timeUs;
     }
 
+    bool wasSeeking = mSeeking;
     finishSeekIfNecessary(timeUs);
 
     TimeSource *ts = (mFlags & AUDIO_AT_EOS) ? &mSystemTimeSource : mTimeSource;
@@ -1268,6 +1269,11 @@
 
     int64_t latenessUs = nowUs - timeUs;
 
+    if (wasSeeking) {
+        // Let's display the first frame after seeking right away.
+        latenessUs = 0;
+    }
+
     if (mRTPSession != NULL) {
         // We'll completely ignore timestamps for gtalk videochat
         // and we'll play incoming video as fast as we get it.