GitLab

First, convert all enums and structs used by existing IPCs to mojo

Next CL will define the Host and Renderer interfaces.

Bug: 611938
Change-Id: I689b7399ad903197073ca15763d73d5bfff3207f
Reviewed-on: https://chromium-review.googlesource.com/790174Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Nick Carter <nick@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Commit-Queue: Nicholas Verne <nverne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520772}