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In the browser process, store the current process name (i.e. the app's
process name) in a crash key, so we can see which app process the
crashes originate from in apps with multiple processes.

In renderer processes this isn't relevant since the process name is
always our own sandboxed process.

Change-Id: I4e0ecb20c064cb06c8905938646c8927aa36b9e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2252942
Auto-Submit: Richard Coles <torne@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Commit-Queue: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781423}