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Affects folders in the bookmark folder as well as subfolders.

We could also log this at the event source using the existing
BookmarkBar_ContextMenu_OpenAll event, but since it's a click/gesture
rather than a context menu action I created a new event type for it.

Bug: 954254
Change-Id: I4ae18d9f2dbdda5448fdc3993e06b6ef76159570
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1574147
Commit-Queue: Dana Fried <dfried@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652610}