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Currently there is no visibility in interventions-internals if a coin
flip is preventing you from seeing a preview. This posts a new event
to that page when a coin flip happens.

Bug: 1000436
Change-Id: I5e1367891acb3e5f57e045a6e55335b081a25357
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1785821
Commit-Queue: Doug Arnett <dougarnett@chromium.org>
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693836}