in shimmer/src/main/java/com/facebook/shimmer/ShimmerFrameLayout.java [143:148]
public void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
final int width = getWidth();
final int height = getHeight();
mShimmerDrawable.setBounds(0, 0, width, height);
}