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This will reduce the amount of code embedders need to pull in in order
to compile the client library.

Bug: 1085553
Change-Id: I1c69c123ec47fd94ef100c7c35f7f150f31055c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2223016
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773946}