SetDeviceScaleFactorForTest

ui/display/win/screen_win.cc

 // Copyright (c) 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.
 
 #include "ui/display/win/screen_win.h"
 
 #include <windows.h>
 #include <shellscalingapi.h>
 
 #include <algorithm>
@@ skipping 412 matching lines @@
   HWND hwnd = view ? GetHWNDFromNativeView(view) : nullptr;
   return ScreenToDIPRect(hwnd, screen_rect);
 }
 
 gfx::Rect ScreenWin::DIPToScreenRectInWindow(gfx::NativeView view,
                                              const gfx::Rect& dip_rect) const {
   HWND hwnd = view ? GetHWNDFromNativeView(view) : nullptr;
   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);
 }
 
 void ScreenWin::Initialize() {
   singleton_hwnd_observer_.reset(
       new gfx::SingletonHwndObserver(
           base::Bind(&ScreenWin::OnWndProc, base::Unretained(this))));
   UpdateFromDisplayInfos(GetDisplayInfosFromSystem());
@@ skipping 135 matching lines @@
     if (std::find(unique_scale_factors.begin(), unique_scale_factors.end(),
                   reported_scale) == unique_scale_factors.end()) {
       unique_scale_factors.push_back(reported_scale);
       UMA_HISTOGRAM_SPARSE_SLOWLY("UI.DeviceScale", reported_scale);
     }
   }
 }
 
 }  // namespace win
 }  // namespace display