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This is the usual boilerplate in SessionManagerClient and friends to
expose the new function.

BUG=chromium:1073940
TEST=None

Change-Id: Id9144ac921d8ab5f26f0874da9476838a3ebef5b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2560271
Commit-Queue: Mattias Nissler <mnissler@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840313}