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ArcCrashCollector calls DumpNativeCrash with file names and FDs when a
new crash dump appears. DumpNativeCrash is responsible to call
crash_reporter. FDs are used for passing the file contents.

BUG=b:136697350
TEST=tast run my_crbook arc.NativeCrash.\* arc.AppCrash.\*

Change-Id: I5017d388eb3182454023b354c3714bbecc664354
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2379331
Commit-Queue: Kimiyuki Onaka <kimiyuki@google.com>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Miriam Zimmerman <mutexlox@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810839}