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This includes:
(1) Adding Proto values for Wifi Sync.
(2) Adding Mojo values in multidevice_types.mojom.
(3) Integrating these types with existing DeviceSync code.
(4) Enrolling with WIFI_SYNC_CLIENT when the flag is enabled.
(5) Add IsWifiSyncAndroidEnabled() function as a simple way
to verify whether WifiSyncAndroid flag is enabled.

Bug: 1117619
Change-Id: I842bcb028d1e311905d60a111cd8bf9524fc72f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2366660Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Jon Mann <jonmann@chromium.org>
Commit-Queue: Claude van der Merwe <cvandermerwe@google.com>
Cr-Commit-Position: refs/heads/master@{#801522}