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Design doc: https://bit.ly/devtools-trust-tokens

This CL adds a new "getTrustTokens" method in the storage
domain that returns the number of available Trust Tokens per issuer.

R=caseq@chromium.org, sigurds@chromium.org

Bug: chromium:1126824
Change-Id: Ic4693dfb5f4d88b54fd0f733ce38acd36632541d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2593112
Commit-Queue: Simon Zünd <szuend@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845562}