[5/5] per-window-scale: Migrate RWHVBase::UpdateScreenInfo

RenderWidgetHostView uses its own display::Display-equivalent struct, so
called "ScreenInfo", which is synchronized with its associated renderers
and contains scale info extracted from its core Display counterpart.
Special handling is needed in order to properly support display servers
that implement only system-controlled window-oriented scaling model,
such as Wayland, otherwise web content rendering will appear distorted
in multi-display mixed-dpi scenarios.

Issues might be observed, for example, when moving a Chrome window (with
'WaylandPerSurface' feature enabled) across displays with different
scales, on Gnome/Wayland 46.1 session on Desktop Linux, with
'scale-monitor-framebuffer' gnome flag enabled.

Design Document:
https://docs.google.com/document/d/1MwvHLrGl5DmODVwt8_iyHEzrn7B5JqC_ABoDP2KUxb0

R=jonross

Bug: 336007385
Change-Id: I6b53d639874a1e78f010f680b9a19b3a23369cd7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5627169
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Reviewed-by: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1315941}