Disable win/ash on high dpi screens

win8/metro_driver/display_properties.cc

Index: win8/metro_driver/display_properties.cc
diff --git a/win8/metro_driver/display_properties.cc b/win8/metro_driver/display_properties.cc
new file mode 100644
index 0000000000000000000000000000000000000000..cf64c68bf91024b4ea10598041947dda44f815b3
--- /dev/null
+++ b/win8/metro_driver/display_properties.cc
@@ -0,0 +1,34 @@
+// Copyright (c) 2013 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 "stdafx.h"
+
+#include <windows.h>
+#include <wrl\implements.h>
+#include <wrl\wrappers\corewrappers.h>
+#include <windows.foundation.h>
+#include <windows.graphics.display.h>
+#include "base/win/scoped_com_initializer.h"
+#include "winrt_utils.h"
+
+#pragma comment(lib, "runtimeobject.lib")
+
+extern "C" {
+
+  __declspec(dllexport) float GetModernUIScale() {
+  base::win::ScopedCOMInitializer com_init;
+  Microsoft::WRL::ComPtr<
+      ABI::Windows::Graphics::Display::IDisplayPropertiesStatics>
+      display_properties;
+  if (SUCCEEDED(winrt_utils::CreateActivationFactory(
+      RuntimeClass_Windows_Graphics_Display_DisplayProperties,
+      display_properties.GetAddressOf()))) {
+    ABI::Windows::Graphics::Display::ResolutionScale resolution_scale;
+    if (SUCCEEDED(display_properties->get_ResolutionScale(&resolution_scale)))
+      return static_cast<float>(resolution_scale) / 100.0f;
+  }
+  return 1.0f;
+}
+
+}