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This also adds the definition of the os-specific path beneath which
crash dumps should be stored.

Change-Id: I500d9e0fef2844550c62dfe6a7e71bddf786f2ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879261
Commit-Queue: Tobias Sargeant <tobiasjs@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709841}