GitLab

This CL consolidates all the UMA logic from configure_displays_task.cc
into helper functions to help reduce the cognitive load when sifting
through the task's logic.

No functional changes.

Test: 
Change-Id: I947c56153ef5ad9799efea67e1cbb2f4674dba9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2566293Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Commit-Queue: Gil Dekel <gildekel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832477}