Use DSF instead of UI scale if the native DSF is 1.25 and UI Scale is 0.8x (dsf=1.25 equivalent)

ash/display/display_controller.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 "ash/display/display_controller.h"
 
 #include <algorithm>
 #include <cmath>
 #include <map>
 
@@ skipping 622 matching lines @@
   // root window itself yet because the stack may be using it.
   controller->Shutdown();
   base::MessageLoop::current()->DeleteSoon(FROM_HERE, controller);
 }
 
 void DisplayController::OnDisplayMetricsChanged(const gfx::Display& display,
                                                 uint32_t metrics) {
   if (!(metrics & (DISPLAY_METRIC_BOUNDS | DISPLAY_METRIC_ROTATION |
                    DISPLAY_METRIC_DEVICE_SCALE_FACTOR)))
     return;
-
   const DisplayInfo& display_info =
       GetDisplayManager()->GetDisplayInfo(display.id());
   DCHECK(!display_info.bounds_in_native().IsEmpty());
   AshWindowTreeHost* ash_host = window_tree_hosts_[display.id()];
   ash_host->AsWindowTreeHost()->SetBounds(display_info.bounds_in_native());
   SetDisplayPropertiesOnHost(ash_host, display);
 }
 
 void DisplayController::OnHostResized(const aura::WindowTreeHost* host) {
   gfx::Display display = Shell::GetScreen()->GetDisplayNearestWindow(
@@ skipping 132 matching lines @@
     std::string name =
         root_windows[i] == primary ? "aura_root_0" : "aura_root_x";
     gfx::AcceleratedWidget xwindow =
         root_windows[i]->GetHost()->GetAcceleratedWidget();
     XStoreName(gfx::GetXDisplay(), xwindow, name.c_str());
   }
 #endif
 }
 
 }  // namespace ash