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To investigate issue 1045372 some crash keys were added to log the old
and new frame tokens however this doesn't work for the flaky browser
tests I am investigating in issue 1022321. This change adds log messages
which should show up when the test flakes.

Bug: 1022321
Change-Id: If1c88d1cea3dc771c96a4d636b6797a8686b6315
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2123030
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Jonathan Ross <jonross@chromium.org>
Reviewed-by: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754145}