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The prototype Trust Token API (https://github.com/wicg/trust-token-api)
provides new JS functionality with which one can specify certain
cryptographic operations to execute along outgoing requests. These
operations can affect persistent state stored in the network service, so
tests exercising them would be non-hermetic absent additional
functionality to reset the state. Additionally, the operations rely on
the presence of "key commitments" (collections of cryptographic keys and
associated metadata) obtained through the component updater in standard
operation; tests need a way to set these keys without relying on the
updater.

This CL adds testRunner bindings to

1. reset persistent Trust Tokens state and
2. manually set Trust Tokens key commitments

so that it's possible to write end-to-end Blink layout tests for the new
Trust Tokens functionality.

Eventually, the same functionality will likely become available through
WPT testdriver, and the Trust Tokens tests will be able to migrate to
WPT: since it's slightly more involved to implement equivalent
functionality via testdriver, this is a first pass allowing writing
end-to-end HTML/JS tests before the equivalent WPT automation exists.

Test: Migrate a WPT to use the state reset binding.
Fixed: 1061764
Change-Id: I0d8b9458f89e1ba4c641f27a189480028957094d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2139444
Commit-Queue: David Van Cleve <davidvc@chromium.org>
Reviewed-by: Matthew Denton <mpdenton@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759493}