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Right now if the utility process hosting the tracing service crashes
while tracing is in progress, the error isn't propagated and the
Tracing.end request will just eventually time out. Instead we now
throw an error right away to make these crashes more actionable.

R=caseq@chromium.org

Bug: 956191
Change-Id: Ie0f176676e9dc5e4ce29b3c228df56180975d483
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1603830
Commit-Queue: oysteine <oysteine@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658407}