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Blink bindings generate use counter names in several locations. This
change updates the name calculation logic to match what's used in
generating the web_feature.mojom file.

In addition, the change also introduces logic to perform a rudimentary
parse step on the web_feature.mojom file and extract the feature value
constants. These are the values that will be used eventually for
locating usage metrics for identifiable APIs.

Bug: 1144960
Change-Id: Id40ccab032f1fb04e1c06bd763847f73180df8a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2552722Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Asanka Herath <asanka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833744}