Only Update the Scale Factor if the Scale Factor Actually Changed

ui/display/win/screen_win.h

Index: ui/display/win/screen_win.h
diff --git a/ui/display/win/screen_win.h b/ui/display/win/screen_win.h
index 65d5f82b39d8349efaf35a6bfc3995cbf96a42e1..0a16da017ce1bfb0afe581c5623f185c1bdf4477 100644
--- a/ui/display/win/screen_win.h
+++ b/ui/display/win/screen_win.h
@@ -92,6 +92,9 @@ class DISPLAY_EXPORT ScreenWin : public display::Screen {
   // Returns the result of GetSystemMetrics for |metric| scaled to |hwnd|'s DPI.
   static int GetSystemMetricsForHwnd(HWND hwnd, int metric);
 
+  // Returns |hwnd|'s scale factor.
+  static float GetScaleFactorForHWND(HWND hwnd);
+
   // Returns the HWND associated with the NativeView.
   virtual HWND GetHWNDFromNativeView(gfx::NativeView window) const;
 
@@ -159,8 +162,6 @@ class DISPLAY_EXPORT ScreenWin : public display::Screen {
 
   ScreenWinDisplay GetScreenWinDisplay(const MONITORINFOEX& monitor_info) const;
 
-  static float GetScaleFactorForHWND(HWND hwnd);
-
   // Returns the result of calling |getter| with |value| on the global
   // ScreenWin if it exists, otherwise return the default ScreenWinDisplay.
   template <typename Getter, typename GetterType>