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This CL takes advantage of the mechanisms introduced in
https://codereview.chromium.org/2979933002/ to run the UI Service inside the
browser process in Mushrome (i.e. when chrome is launched with --mus parameter).

UI Service runs on a separate thread with high priority. For now both the UI
Service and the GPU Service are moved. Once WS/GPU split if finished, GPU will
need to be moved into its separate process.

CrOS BrowserProcessPlatformPart owns the ImageCursorsSet used by the UI Service
for cursor manipulation.

BUG=722527

Review-Url: https://codereview.chromium.org/2983443002
Cr-Commit-Position: refs/heads/master@{#486688}