Disable win/ash on high dpi screens

ui/gfx/win/dpi.cc

Index: ui/gfx/win/dpi.cc
diff --git a/ui/gfx/win/dpi.cc b/ui/gfx/win/dpi.cc
index e6855283f1dcd03cddc53d66f3fa44ce0b880779..8dc3effc9fcd66739af052a972784fa1b9e84775 100644
--- a/ui/gfx/win/dpi.cc
+++ b/ui/gfx/win/dpi.cc
@@ -5,7 +5,12 @@
 #include "ui/gfx/win/dpi.h"
 
 #include <windows.h>
-#include "base/command_line.h"
+#include <wrl\implements.h>
+#include <wrl\wrappers\corewrappers.h>
+#include <windows.foundation.h>
+#include <windows.graphics.display.h>
+#include "base/command_line.h"
+#include "base/win/scoped_com_initializer.h"
 #include "base/win/scoped_hdc.h"
 #include "base/win/windows_version.h"
 #include "base/win/registry.h"
@@ -14,6 +19,7 @@
 #include "ui/gfx/point_conversions.h"
 #include "ui/gfx/rect_conversions.h"
 #include "ui/gfx/size_conversions.h"
+#pragma comment(lib, "runtimeobject.lib")
 
 namespace {
 
@@ -32,10 +38,44 @@ BOOL IsProcessDPIAwareWrapper() {
 
 float g_device_scale_factor = 0.0f;
 
+// TODO: Merge this with implementation in win8/metro_driver/winrt_utils.cc
+void CheckHR(HRESULT hr, const char* message) {
+  if (FAILED(hr)) {
+    if (message)
+      PLOG(DFATAL) << message << ", hr = " << std::hex << hr;
+    else
+      PLOG(DFATAL) << "COM ERROR" << ", hr = " << std::hex << hr;
+  }
+}
+
+// TODO: Merge this with implementation in win8/metro_driver/winrt_utils.h
+template<unsigned int size, typename T>
+HRESULT CreateActivationFactory(wchar_t const (&class_name)[size], T** object) {
+  Microsoft::WRL::Wrappers::HStringReference ref_class_name(class_name);
+  return ABI::Windows::Foundation::GetActivationFactory(ref_class_name.Get(),
+      object);
+}
+
+
 }  // namespace
 
 namespace gfx {
 
+float GetModernUIScale() {
+  base::win::ScopedCOMInitializer com_init;
+  Microsoft::WRL::ComPtr<
+      ABI::Windows::Graphics::Display::IDisplayPropertiesStatics>
+      display_properties;
+  if (SUCCEEDED(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;

[Ben Goodger (Google), 2013/11/20 18:44:36]

nit spaces around /

+  }
+  return 1.0f;
+}
+
 void InitDeviceScaleFactor(float scale) {
   DCHECK_NE(0.0f, scale);
   g_device_scale_factor = scale;
@@ -153,7 +193,6 @@ double GetUndocumentedDPIScale() {
   return scale;
 }
 
-
 double GetUndocumentedDPITouchScale() {
   static double scale =
       (base::win::GetVersion() < base::win::VERSION_WIN8_1) ?
@@ -161,6 +200,5 @@ double GetUndocumentedDPITouchScale() {
   return scale;
 }
 
-
 }  // namespace win
 }  // namespace gfx