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Enable Crashpad collection of minidumps on Android. Other platforms are
skipped because the concept of the user data directory is OS-specific.
On Android specifically crashes are written to
[app-data-dir]/cache/Crashpad.

Test: manual
Test: Check current crash count with:
Test: adb shell ls '/data/data/org.chromium.weblayer.shell/cache/Crashpad/pending/*.dmp' | wc -l
Test: load chrome://crash or chrome://inducebrowsercrashforrealz
Test: Check crash count has increased by 1
Change-Id: I9718754dc4218e7e2f2e7737de420db83d4de14b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1883653
Commit-Queue: Tobias Sargeant <tobiasjs@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711180}