This should reduce the probability of running out of stack space while logging
a fatal error message.
Additionally this CL distinguishes the error OOM error message when there is no
isolate available on the background thread.

Bug: chromium:839166
Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Change-Id: I17e929f322dda20127fbf86a6154af5460e53490
Reviewed-on: https://chromium-review.googlesource.com/1041964Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52958}