@Override
  public void onDrawFrameStart(BitmapAnimationBackend backend, int frameNumber) {
    mLastFrameStart = System.currentTimeMillis();
    FLog.d(TAG, "Frame: event=start, number=%d", frameNumber);
  }
{@link com.facebook.fresco.animation.bitmap.BitmapAnimationBackend.FrameListener} that logs
animation statistics.
samples/animation2/src/main/java/com/facebook/samples/animation2/bitmap/DebugBitmapAnimationFrameListener.java