Enable calc() parsing in the sizes attribute

This CL enabled calc parsing in the sizes attribute, and adds tests for that.

BUG=357586
Depends on http://crrev.com/252743004

Review URL: https://codereview.chromium.org/259193004

git-svn-id: svn://svn.chromium.org/blink/trunk@173000 bbb929c8-8fbe-4397-9dbb-9b2b20218538