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This adds a new browsertest which adds a hook into the feedback uploader
to catch it right before it does the actual report upload. This ensures
that clicking on the button to send a feedback report actually results
in the report getting queued to be sent. This covers a regression case
which is in crbug.com/954563.

Bug: 955039, 954563
Test: Browser tests pass, fail if prior regression was put back
Change-Id: I92762c1b6741ad057e78c8cafeb924f93995b249
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1632534
Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666036}