feat: expose app accessibility transparency settings api (#39631)

* feat: expose app accessibility transparency settings api

* docs: fix typo

* chore: add doc

* change to property

* add as property instead of method

* chore: fix lint

* rename function name in header

---------

Co-authored-by: Keeley Hammond <vertedinde@electronjs.org>

shell/browser/api/electron_api_system_preferences.cc

@@ -95,6 +95,9 @@ gin::ObjectTemplateBuilder SystemPreferences::GetObjectTemplateBuilder(
       .SetMethod("isTrustedAccessibilityClient",
                  &SystemPreferences::IsTrustedAccessibilityClient)
       .SetMethod("askForMediaAccess", &SystemPreferences::AskForMediaAccess)
+      .SetProperty(
+          "accessibilityDisplayShouldReduceTransparency",
+          &SystemPreferences::AccessibilityDisplayShouldReduceTransparency)
 #endif
       .SetMethod("getAnimationSettings",
                  &SystemPreferences::GetAnimationSettings);

shell/browser/api/electron_api_system_preferences.h

@@ -96,6 +96,7 @@ class SystemPreferences
                       gin::Arguments* args);
   void RemoveUserDefault(const std::string& name);
   bool IsSwipeTrackingFromScrollEventsEnabled();
+  bool AccessibilityDisplayShouldReduceTransparency();
 
   std::string GetSystemColor(gin_helper::ErrorThrower thrower,
                              const std::string& color);

shell/browser/api/electron_api_system_preferences_mac.mm

@@ -598,4 +598,9 @@ v8::Local<v8::Value> SystemPreferences::GetEffectiveAppearance(
       isolate, [NSApplication sharedApplication].effectiveAppearance);
 }
 
+bool SystemPreferences::AccessibilityDisplayShouldReduceTransparency() {
+  return [[NSWorkspace sharedWorkspace]
+      accessibilityDisplayShouldReduceTransparency];
+}
+
 }  // namespace electron::api