Add test script for sanity of font fallback chain

Various tests have been added:

1. Availability of hyphens: Make sure that every font used for
rendering a language that is automatically hyphenated includes either
of Unicode hyphen characters U+2010 HYPHEN or U+002D HYPHEN-MINUS.

2. Range of values: Make sure that styles, weights, and styles belong
to certain limited sets.

Bug: 26187231
Bug: 21570828
Bug: 21815394
Change-Id: Ia63d63cc8da4f2d6bc81fe5619ccac6cfcd9a54e