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This change add a method to request Chrome to send all existing mount
points. This method is called everytime vold is reseting.

Bug: 64500663
Change-Id: If10577a3d40ebd240a2ad242f703a28ecd3c363e
Reviewed-on: https://chromium-review.googlesource.com/938683
Commit-Queue: Risan <risan@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Mattias Nissler <mnissler@chromium.org>
Reviewed-by: Luis Hector Chavez <lhchavez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539785}