HTML API: Provide mechanism to scan all tokens in an HTML document, not only the tags. #835

Job	Run time
Core running from build / Core running from build / Linux	1m 55s
Core running from src / Core running from src / Linux	1m 54s
Core running from build / Core running from build / Windows	3m 22s
Core running from src / Core running from src / Windows	4m 45s
Core running from build / Core running from build / MacOS	4m 31s
Core running from src / Core running from src / MacOS	3m 30s
Gutenberg running from build / Gutenberg running from build / Linux	7m 12s
Gutenberg running from src / Gutenberg running from src / Linux	7m 18s
Gutenberg running from build / Gutenberg running from build / Windows	11m 53s
Gutenberg running from src / Gutenberg running from src / Windows	11m 2s
Gutenberg running from build / Gutenberg running from build / MacOS	10m 6s
Gutenberg running from src / Gutenberg running from src / MacOS	13m 19s
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	1h 20m 49s

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