SetDeviceScaleFactorForTest

ui/display/win/screen_win.cc

Index: ui/display/win/screen_win.cc
diff --git a/ui/display/win/screen_win.cc b/ui/display/win/screen_win.cc
index d9f85c364bfe6f3aa5cf6329878da36ed1fca2a1..1d554bddf313e821f5cef1568af1b4cb955a9d8f 100644
--- a/ui/display/win/screen_win.cc
+++ b/ui/display/win/screen_win.cc
@@ -430,6 +430,14 @@ gfx::Rect ScreenWin::DIPToScreenRectInWindow(gfx::NativeView view,
   return DIPToScreenRect(hwnd, dip_rect);
 }
 
+void ScreenWin::SetDeviceScaleFactorForTest(float scale_factor) {
+  LOG(ERROR) << "Set DSF:" << scale_factor;
+  display::Display::SetForceDeviceScaleFactorForTesting(scale_factor);
+  std::vector<display::Display> old_displays = GetAllDisplays();
+  UpdateFromDisplayInfos(GetDisplayInfosFromSystem());
+  change_notifier_.NotifyDisplaysChanged(old_displays, GetAllDisplays());
+}
+
 void ScreenWin::UpdateFromDisplayInfos(
     const std::vector<DisplayInfo>& display_infos) {
   screen_win_displays_ = DisplayInfosToScreenWinDisplays(display_infos);