SetDeviceScaleFactorForTest

ash/display/screen_ash.cc

Index: ash/display/screen_ash.cc
diff --git a/ash/display/screen_ash.cc b/ash/display/screen_ash.cc
index 7ec4f86eec0851c4f93e5b756596ac6e654de501..ee8ab1302f391b863f7e8d81f8c1179e9459a3e1 100644
--- a/ash/display/screen_ash.cc
+++ b/ash/display/screen_ash.cc
@@ -187,6 +187,11 @@ void ScreenAsh::RemoveObserver(display::DisplayObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
+void ScreenAsh::SetDeviceScaleFactorForTest(float scale_factor) {
+  display::Display::SetForceDeviceScaleFactorForTesting(scale_factor);
+  GetDisplayManager()->UpdateDisplays();
+}
+
 display::Screen* ScreenAsh::CloneForShutdown() {
   return new ScreenForShutdown(this);
 }