Correct title bar size for HiDPI Windows

ui/base/win/dpi.h

 // 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_BASE_WIN_DPI_H_
 #define UI_BASE_WIN_DPI_H_
 
 #include "ui/gfx/point.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
@@ skipping 20 matching lines @@
 UI_EXPORT gfx::Point ScreenToDIPPoint(const gfx::Point& pixel_point);
 
 UI_EXPORT gfx::Rect ScreenToDIPRect(const gfx::Rect& pixel_bounds);
 
 UI_EXPORT gfx::Rect DIPToScreenRect(const gfx::Rect& dip_bounds);
 
 UI_EXPORT gfx::Size ScreenToDIPSize(const gfx::Size& size_in_pixels);
 
 UI_EXPORT gfx::Size DIPToScreenSize(const gfx::Size& dip_size);
 
+// Win32's GetSystemMetrics uses pixel measures. This function calls
+// GetSystemMetrics for the given |metric|, then converts the result to DIP.
+UI_EXPORT int GetSystemMetricsInDIP(int metric);
+
 // The OS secretly scales apps that are not DPIAware. This is not visible
 // through standard OS calls like GetWindowPos(), or through GetDPIScale().
 // Returns the scale factor of the display, where 96 DPI is 1.0.
 // (Avoid this function... use GetDPIScale() instead.)
 // TODO(girard): Remove this once DPIAware is enabled - http://crbug.com/149881
 UI_EXPORT double GetUndocumentedDPIScale();
 
 }  // namespace win
 
 }  // namespace ui
 
 #endif  // UI_BASE_WIN_DPI_H_