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This CL introduces a new experimental CDP event in the network domain.
As mentioned in the event documentation, the event can fire before
the corresponding network request is sent, or after the response
is received, depending on success/failure and the type of the
Trust Token operation.

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

Bug: chromium:1126824
Change-Id: I57fad66b08200ce8c98c44b8406b805627fd3b6a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2554542
Commit-Queue: Simon Zünd <szuend@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831980}