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On fuchsia, network connectivity does not guarantee that the time has
synced. This change adds TimeSyncTracker in order to give fuchsia a
means to block global connectivity until this process is complete.

Bug: 162553428
Test: Manual

Change-Id: Ied2fa293247a860ddc85b62dbbf554abb2c75be5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2503406
Commit-Queue: Christopher Whelan <chwhelan@google.com>
Reviewed-by: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822017}