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Simultaneously, put existing event types in enums.

Bug: 1134208
Change-Id: Ia4a3d7f6d03c0969b1f18961db0899a8a7f51b9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2512368
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824589}