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With this CL we are properly dialing the XPC connection and sending messages.
This also fixes the issues with the StateChangeCallback being sent over XPC.

Bug: 1055876
Change-Id: I81077476e49be486620ae4e2eb8cba022c3ae4de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2124933
Commit-Queue: Mila Green <milagreen@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754971}