@VisibleForTesting
  Looper getWarmHandlerLooper() {
    return getWarmHandler().getLooper();
  }
Default {@link GlyphWarmer} that runs a {@link HandlerThread} to draw a text {@link Layout} on a
{@link Picture}. This helps in warming up the FreeType cache in Android 4.0+.
library/src/main/java/com/facebook/fbui/textlayoutbuilder/glyphwarmer/GlyphWarmerImpl.java