Add more cases of box-sizing change

- Add cases of changing box-sizing and border at the same time while
  keeping the actual size;
- Add cases of changing box-sizing and padding at the same time while
  keeping the actual size;
- Add cases changing box-sizing from content-box to border-box.

BUG=375876

Review URL: https://codereview.chromium.org/350043003

git-svn-id: svn://svn.chromium.org/blink/trunk@176783 bbb929c8-8fbe-4397-9dbb-9b2b20218538