[css-properties-values-api] Test computed values individually.

 - Having large buckets of assertions in the same test is not great if
   one of those assertions fail.
 - Running all tests twice with and without inherited font size is not
   relevant for a large amount of the tests.

Therefore:

 - Use only one assertion per test, allowing fine-grained test
   expectations.
 - Only test inherited font-size for a few relevant cases.

R=futhark@chromium.org

Bug: 641877
Change-Id: I0a26dc29da4ca3be04f33b86bb063e48cb2f4c08
Reviewed-on: https://chromium-review.googlesource.com/c/1304520
Commit-Queue: Anders Ruud <andruud@chromium.org>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603850}
2 files changed