Fix font sizes being incorrect when using --force-device-scale-factor.

ui/display/win/dpi.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_DISPLAY_WIN_DPI_H_
 #define UI_DISPLAY_WIN_DPI_H_
 
 #include "ui/display/display_export.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace display {
 namespace win {
 
 // Deprecated. Use --force-device-scale-factor instead.
 //
 // Sets the device scale factor that will be used unless overridden on the
 // command line by --force-device-scale-factor.
 DISPLAY_EXPORT void SetDefaultDeviceScaleFactor(float scale);
 
 // Deprecated. Use win::ScreenWin::GetScaleFactorForHWND instead.
 //
 // Gets the system's scale factor. For example, if the system DPI is 96 then the
 // scale factor is 1.0. This does not handle per-monitor DPI.
 DISPLAY_EXPORT float GetDPIScale();
 
+// Equivalent to GetDPIScale() but ignores the --force-device-scale-factor flag.
+float GetUnforcedDeviceScaleFactor();
+
 // Returns the equivalent DPI for |device_scaling_factor|.
 DISPLAY_EXPORT int GetDPIFromScalingFactor(float device_scaling_factor);
 
 // Returns the equivalent scaling factor for |dpi|.
 DISPLAY_EXPORT float GetScalingFactorFromDPI(int dpi);
 
 }  // namespace win
 }  // namespace display
 
 #endif  // UI_DISPLAY_WIN_DPI_H_