commit 756e64489c84c22998470beddb1facab5e78e1fa
author Nick Diego Yamane <nickdiego@igalia.com> Tue Sep 24 16:38:16 2024
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> Tue Sep 24 16:38:16 2024
tree 707f003eb72a72123996514b55de59fbac9e3a1d
parent 74a5382ac8bb0b825627fdfc3a35ccede9187d9f

wayland ui scaling: scale chrome UI upon LinuxUi's font scale changes

This is part of the set of changes required to support Desktop
Environment's "Large Text" accessibility setting in Chromium's Wayland
backend. It actually can also be triggered by other system tools, such
as, Gnome Tweaks app as well as gsettings command line tool in Gnome
ecosystem.

Design doc:
https://docs.google.com/document/d/16kwPm_S0dmxe4kSgKY0_PA7aFvkFcftx6AMzNqT8Nfg

This implements the first part of chrome UI scaling upon LinuxUi's font
scale changes. To do so, it adds a ui_scale field to
PlatformWindowDelegate::State struct and fires OnBoundsChanged callback
when font scale change is triggered by GtkUi. The bounds change consists
of a ui scale update but keeping the DIP window size unchanged, which
will result in a UI content resize and relayout. The feature is behind
the newly added `WaylandUiScale` feature flag, disabled by default.

At this point the follow command line flags must be used to enable the
WIP feature implemented by this patch series:

`gtk-version=4 --enable-features=WaylandPerSurfaceScale,WaylandUiScale`

Upcoming CLs will implement the remaining required functionality to
fully support this new UI scaling feature.

Bug: 40856031, 41486578
Change-Id: Ie58d1f0fd4ec30795bf84f12f02028e4c7951287
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5852358
Reviewed-by: Eliot Courtney <edcourtney@chromium.org>
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Reviewed-by: Kramer Ge <fangzhoug@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1359412}