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Existing BreadcrumbManagers are associated with BrowserStates via
BreadcrumbManagerKeyedService instances. This CL adds an application
wide BreadcrumbManager for logging global events not tied to a specific
BrowserState.

Logged events currently come from listening to UserActions and memory
pressure events.

Bug: 1003922
Change-Id: If0e1db381755043d85487e0a85fbb9037abae263
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1987368
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733823}