Get the default device scale factor from monitor

ui/gfx/gfx_switches.h

Index: ui/gfx/gfx_switches.h
diff --git a/ui/gfx/gfx_switches.h b/ui/gfx/gfx_switches.h
new file mode 100644
index 0000000000000000000000000000000000000000..2def39e5194acc2d4acb2fa3d56a3a9409a0a368
--- /dev/null
+++ b/ui/gfx/gfx_switches.h
@@ -0,0 +1,17 @@
+// 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.
+
+#ifndef UI_GFX_GFX_SWITCHES_H_
+#define UI_GFX_GFX_SWITCHES_H_
+#pragma once
+
+#include "ui/base/ui_export.h"
+
+namespace switches {
+
+UI_EXPORT extern const char kDefaultDeviceScaleFactor[];

[sadrul, 2012/04/30 18:57:00]

Perhaps it makes sense to move this into ui_base_switches?

[oshima, 2012/04/30 19:41:14]

Didn't know about the file. Thanks. Done.

+
+}  // namespace switches
+
+#endif  // UI_GFX_GFX_SWITCHES_H_