Sync for validator cpp engine and cpp htmlparser

[Gregable]

This is an automatically generated pull request.

[amp-owners-bot]

Hey @ampproject/wg-caching! These files were changed:

validator/cpp/htmlparser/BUILD
validator/cpp/htmlparser/bin/statetablegen.cc
validator/cpp/htmlparser/css/BUILD
validator/cpp/htmlparser/css/amp4ads-parse-css_test.cc
validator/cpp/htmlparser/css/parse-css-urls.cc
validator/cpp/htmlparser/css/parse-css-urls.h
validator/cpp/htmlparser/css/parse-css-urls_test.cc
validator/cpp/htmlparser/css/parse-css.cc
validator/cpp/htmlparser/css/parse-css.h
validator/cpp/htmlparser/css/parse-css_test.cc
validator/cpp/htmlparser/htmldataset_test.cc
validator/cpp/htmlparser/logging.h
+3 more