GitLab

screen_win.cc cleanup part 5

Split helpers out of some long or complex functions to facilitate
better understanding and future simplification/signature changes.

No change to the actual algorithms/code (yet).

Bug: none
Change-Id: I8719df7ca6960fb7472fa4ffb462978daae52075
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2109256
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751835}