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We will use these types from both blink and //content and from code
inside //components.

This patch affects Clank downstream and will be submitted together with
a patch in that repo to avoid breakage. Clank CL:
https://crrev.com/i/2545991

See discussion in design doc:
https://docs.google.com/document/d/1ZA-1EMq4d40K5qfsZoeMIhJmZA6-AXaSibD3SsqZjfU/edit#

Bug: 1044252
Change-Id: Id658caa422bedbcb6d2275a8ccdd76f73bf955c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2051363Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Commit-Queue: Sam Bowen <sgbowen@google.com>
Cr-Commit-Position: refs/heads/master@{#741227}