(DO NOT LAND) Test CSS Font Style matching

(DO NOT LAND) Test CSS Font Style matching

The font style matching algorithm [1] of the CSS3 Fonts Module spec
describes precedence rules for stretch, style, weight. This test
exercises all combinations of fixed values and compares requested
stretch, style and weight to the actual font selected by Blink.

Using a generated set of test fonts we can query for the selected font
family name. Each TTF has a different family name, describing its
stretch, style and weight properties. This helps for finding out which
actual font file Blink has loaded.

BUG=513669, 513670

[drott, 2015-07-24 13:27:13]

drott@chromium.org changed reviewers:
+ behdad@chromium.org, eae@chromium.org, kojii@chromium.org

[drott, 2015-07-24 13:27:14]

FYI, the bot test results should show where we're failing.

[pfeldman, 2015-07-24 17:07:02]

If you plan to land something like this, I am not sure that inspector-protocol/
is the right place. You can use this harness anywhere, test_interfaces does not
do anything special for inspector-protocol/.

[eae, 2015-07-24 17:09:17]

Looks really promising, thanks for doing all this work.