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Both the browser and child processes determine whether they will
produce crash dumps at initialization. When crash dumping is disabled
for the browser, no signal handler is installed. Child processes with
crash dumping disabled will still install a signal handler so the
browser and any observers can be notified of the crash, but the child
process will send a byte along with its message to the CrashHandlerHost
noting whether a dump should be produced.

Change-Id: I7acde16b604ecdcad124cb95677e127fc099e0e8
Reviewed-on: https://chromium-review.googlesource.com/c/1298651
Commit-Queue: Joshua Peraza <jperaza@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612959}