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Add an API call "setActionCountAsBadgeText" to toggle an extension's
preference for setting the # of actions matched by its ruleset. This CL
only adds the call itself and preference. The functionality will be
implemented in a follow up.

Skipping presubmit as the idl parser fails weirdly as seen
in crbug.com/956368

NOPRESUBMIT=true

Bug: 973211
Change-Id: I9e98cb4ac13fba3d18012f716753e613507b2747
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1642275
Commit-Queue: Kelvin Jiang <kelvinjiang@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#668588}