[misc-uiautomation] Add reference file for html5-extra

Impacted tests: new 0, update 3, delete 0
Unit test platform: [Chromium]
Unit test result summary: pass 3, fail 0, block 0
I am not sure why you say the html5 tests come from csswg-test; but do you mean all the reference files are from there? If yes, why you add Intel BSD license into each reference file.

Another, for these reference files, which tests referred them? You don't add the reference link to the test files.