gen_wpt_cts_html: Detect too-long variant names, handle expectation input more robustly (#189)
gen_wpt_cts_html: Detect too-long variant names, handle expectation input more robustly (#189)

* Detect too-long variant names

* gen_wpt_cts_html: Allow unmatched and duplicate expectation lines
gpuweb/cts,gpuweb/cts,gpuweb/cts