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This is part of a series of changes to improve crash reporting for
chrome://media-app (& incidentally other clients of crashReportPrivate).

Design doc: go/backlight-better-crash-report

We need chrome/ dependencies for
* determining chrome window type (regular, app, SWA).
* solid testing for opening & closing devtools
https://chromium-review.googlesource.com/c/chromium/src/+/2465407/comment/90edd371_2e37132d/
(that cl will be rebased on this)
And once this is ported, it also makes sense to
* grab app locale from the browser process
* grab renderer uptime with a chrome dep

This also ports crashReportPrivate tests from extensions_browsertests
to browser_tests.

Change-Id: I4bc51f0cb69927ffb07d8045a82b180ed308590b
Bug: b/169635499
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438099
Auto-Submit: David Lei <dlei@google.com>
Reviewed-by: Ian Barkley-Yeung <iby@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Commit-Queue: David Lei <dlei@google.com>
Cr-Commit-Position: refs/heads/master@{#819088}