GitLab

Only increment stability proto renderer crash rate if the crash dump is
valid.

BUG=786992

Change-Id: I63e4d24bdd9d258775bba21b611414770424d57c
Reviewed-on: https://chromium-review.googlesource.com/779480
Commit-Queue: Peter Wen <wnwen@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517890}