public void flipTo(final boolean side) {
        if (mFlipToSide != side) {
            flip();
        }
    }
Start an animated flip to a side. This works regardless of whether a flip animation is
currently started.

@param side Pass true if flip to front, false if flip to back.
android/modules/module_common/src/main/java/github/tornaco/android/thanos/widget/checkable/FlipDrawable.java