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This is a preliminary change to share the implementation across
multiple Chromium content embedders.

Bug: 1042501
Change-Id: I398c0810de589529a0037875a30ad33c2f65aa50
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2013725
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735672}