Android: Exclude DumpWithoutCrashing in metrics

Our current metrics and other platforms all exclude DumpWithoutCrashing
counts from stability metrics since these are simulated crashes, not
real user-facing crashes.

This splits ProcessedMinidumps histogram in two, one counting all the
non-simulated exceptions and one counting the simulated ones.

Also adds an enum for the utility process.

Bug: 894027
Change-Id: I46d2b2b4dc4d57e503761ceb87e7260204da60da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1573661
Commit-Queue: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Auto-Submit: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653755}
2 files changed