Bug 185939

WOFF2 WPT tests were imported in bug 179108 but only enabled on the GTK port for now. @Myles: For the record, the success rate on the macOS port is ~86%: 264 tests ran as expected, 37 didn't: Unexpected flakiness: blocks-extraneous-data-001.xht header-signature-001.xht Regressions: Unexpected blocks-extraneous-data-002.xht blocks-extraneous-data-003.xht blocks-extraneous-data-004.xht blocks-extraneous-data-005.xht blocks-extraneous-data-006.xht blocks-extraneous-data-007.xht blocks-extraneous-data-008.xht blocks-overlap-001.xht blocks-overlap-002.xht blocks-overlap-003.xht datatypes-invalid-base128-001.xht datatypes-invalid-base128-002.xht datatypes-invalid-base128-003.xht directory-mismatched-tables-001.xht header-length-001.xht header-length-002.xht header-numTables-001.xht tabledata-bad-origlength-loca-001.xht tabledata-bad-origlength-loca-002.xht tabledata-brotli-001.xht tabledata-decompressed-length-001.xht tabledata-decompressed-length-002.xht tabledata-decompressed-length-003.xht tabledata-decompressed-length-004.xht tabledata-extraneous-data-001.xht tabledata-glyf-bbox-001.xht tabledata-glyf-bbox-002.xht tabledata-glyf-bbox-003.xht tabledata-glyf-origlength-001.xht tabledata-glyf-origlength-002.xht tabledata-non-zero-loca-001.xht tabledata-transform-bad-flag-001.xht tabledata-transform-bad-flag-002.xht tabledata-transform-hmtx-003.xht tabledata-transform-hmtx-004.xht