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Also, adds additional PRESUBMIT checks to ensure automation keeps in sync with
ax_enums for MarkerType.

Test: existing browser_tests --gtest_filter=ChromeVoxEditing*.*
Change-Id: I58556cc8317cbca62f00aed8d9f3afbcf7feeee2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1940868
Commit-Queue: David Tseng <dtseng@chromium.org>
Reviewed-by: Akihiro Ota <akihiroota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721368}