Disable prefers reduced motion: Disables the possibility of retrieving the device user setting via css prefers-reduced-motion (#2032)

build/cromite_patches_list.txt

@@ -299,6 +299,7 @@ Android-fonts-fingerprinting-mitigation.patch
 Disable-Android-Tab-Declutter.patch
 Disable-CSSDynamicRangeLimit.patch
 Android-Import-Passwords.patch
+Disable-prefers-reduced-motion.patch
 
 # temporary or wip patches
 Temp-PerformanceNavigationTiming-privacy-fix.patch

build/patches/Disable-prefers-reduced-motion.patch

@@ -0,0 +1,56 @@
+From: uazo <uazo@users.noreply.github.com>
+Date: Fri, 30 May 2025 10:29:39 +0000
+Subject: Disable prefers reduced motion
+
+Disables the possibility of retrieving the device user setting via
+css prefers-reduced-motion
+
+License: GPL-2.0-or-later - https://spdx.org/licenses/GPL-2.0-or-later.html
+---
+ ui/android/java/src/org/chromium/ui/gfx/Animation.java | 1 +
+ ui/gfx/animation/animation_linux.cc                    | 1 +
+ ui/gfx/animation/animation_win.cc                      | 2 ++
+ 3 files changed, 4 insertions(+)
+
+diff --git a/ui/android/java/src/org/chromium/ui/gfx/Animation.java b/ui/android/java/src/org/chromium/ui/gfx/Animation.java
+--- a/ui/android/java/src/org/chromium/ui/gfx/Animation.java
++++ b/ui/android/java/src/org/chromium/ui/gfx/Animation.java
+@@ -21,6 +21,7 @@ import org.chromium.build.annotations.NullMarked;
+ public class Animation {
+     @CalledByNative
+     private static boolean prefersReducedMotion() {
++        if ((true)) return false;
+         // We default to assuming that animations are enabled, to avoid impacting the experience for
+         // users that don't have ANIMATOR_DURATION_SCALE defined.
+         final float defaultScale = 1f;
+diff --git a/ui/gfx/animation/animation_linux.cc b/ui/gfx/animation/animation_linux.cc
+--- a/ui/gfx/animation/animation_linux.cc
++++ b/ui/gfx/animation/animation_linux.cc
+@@ -13,6 +13,7 @@ namespace {
+ // Linux toolkits only have a global setting for whether animations should be
+ // enabled.  So use it for all of the specific settings that Chrome needs.
+ bool AnimationsEnabled() {
++  if ((true)) return true;
+   auto* linux_ui = ui::LinuxUi::instance();
+   return !linux_ui || linux_ui->AnimationsEnabled();
+ }
+diff --git a/ui/gfx/animation/animation_win.cc b/ui/gfx/animation/animation_win.cc
+--- a/ui/gfx/animation/animation_win.cc
++++ b/ui/gfx/animation/animation_win.cc
+@@ -12,6 +12,7 @@ namespace gfx {
+ 
+ // static
+ bool Animation::ShouldRenderRichAnimationImpl() {
++  if ((true)) return true;
+   BOOL result;
+   // Get "Turn off all unnecessary animations" value.
+   if (::SystemParametersInfo(SPI_GETCLIENTAREAANIMATION, 0, &result, 0)) {
+@@ -27,6 +28,7 @@ bool Animation::ScrollAnimationsEnabledBySystem() {
+ 
+ // static
+ void Animation::UpdatePrefersReducedMotion() {
++  if ((true)) return false;
+   // prefers_reduced_motion_ should only be modified on the UI thread.
+   // TODO(crbug.com/40611878): DCHECK this assertion once tests are
+   // well-behaved.
+--