Allow Chrome on Windows to draw at 1.25 device scale factor.

ui/display/win/dpi.cc

 // 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.
 
 #include "ui/display/win/dpi.h"
 
 #include <windows.h>
 
 #include "base/win/scoped_hdc.h"
 #include "ui/display/display.h"
@@ skipping 33 matching lines @@
 }  // namespace
 
 void SetDefaultDeviceScaleFactor(float scale) {
   DCHECK_NE(0.f, scale);
   g_device_scale_factor = scale;
 }
 
 float GetDPIScale() {
   if (display::Display::HasForceDeviceScaleFactor())
     return display::Display::GetForcedDeviceScaleFactor();
-  float dpi_scale = GetUnforcedDeviceScaleFactor();
-  return (dpi_scale <= 1.25f) ? 1.f : dpi_scale;

[robliao, 2016/07/18 23:53:40]

Update the ScreenWin unit tests to allow for the new 1-1.25 scales.

[Bret, 2016/07/19 18:30:30]

Done.

+  return GetUnforcedDeviceScaleFactor();

[oshima, 2016/07/18 23:51:34]

will this enable other values like 1.1 ? If so, you probably want to double
check if it looks ok.

 }
 
 int GetDPIFromScalingFactor(float device_scaling_factor) {
   return kDefaultDPI * device_scaling_factor;
 }
 
 float GetScalingFactorFromDPI(int dpi) {
   return static_cast<float>(dpi) / kDefaultDPI;
 }
 
 int GetSystemMetricsInDIP(int metric) {
   // The system metrics always reflect the system DPI, not whatever scale we've
   // forced or decided to use.
   return static_cast<int>(
       std::round(GetSystemMetrics(metric) / GetUnforcedDeviceScaleFactor()));
 }
 
 }  // namespace win
 }  // namespace display