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The code to extract DOM features is undergoing a moderate-size
refactoring and this metric could be useful in diagnosing a regression.

Fixed: 1160884
Change-Id: I9e970610a5b69e2a31d5d4e829cf87b1ec2fccd8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2610956
Auto-Submit: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
Commit-Queue: Caitlin Fischer <caitlinfischer@google.com>
Cr-Commit-Position: refs/heads/master@{#840640}