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A page may not be submitting frames because blink isn't allowing it to
submit frames based on various states. In these cases, the browser
should not be showing UI indicating that the page is unresponsive.
This change adds plumbing for blink to inform the browser process that
it is the one throttling frame requests so that the browser can suspend
any timeout logic, and potentially (in the future) take over rendering
a more customized message.

Bug: 1009813
Change-Id: I2d1a3bb609eb305225493b67c630b32999735a6b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1841585Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704461}