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When "release official" builds crash, the Crashpad produces (among other
things), detailed minidumps in the app's "cache" directory. Fetch the
latest of those, extract the likely native library name for it, generate
symbols for it, and print the (symbolized) stack traces.

This script is intented to primarily be used by Catapult to provide more
detailed information about native crashes. The output is more verbose
than our usual stack traces, which is good for understanding what
happens on remote bots.

Bug: 925453
Change-Id: I15981d49b1072123a56b268f5a222311e6e7d1a0
Reviewed-on: https://chromium-review.googlesource.com/c/1477858Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Auto-Submit: Egor Pasko <pasko@chromium.org>
Commit-Queue: Egor Pasko <pasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634314}