Fix high-DPI on Windows to make use of DIP scaling in WebKit.

ui/gfx/display.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_GFX_DISPLAY_H_
 #define UI_GFX_DISPLAY_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/base/ui_export.h"
@@ skipping 10 matching lines @@
   // Creates a display with kInvalidDisplayID as default.
   Display();
   explicit Display(int64 id);
   Display(int64 id, const Rect& bounds);
   ~Display();
 
   // Returns the forced device scale factor, which is given by
   // "--force-device-scale-factor".
   static float GetForcedDeviceScaleFactor();
 
+  // Indicates if a device scale factor is being explicitly enforced from the
+  // command line via "--force-device-scale-factor".
+  static bool HasForceDeviceScaleFactor();
+
   // Returns 64-bit persistent ID for the specified manufacturer's ID and
   // serial#.
   static int64 GetID(uint16 manufacturer_id, uint32 serial_number);
 
   // Sets/Gets unique identifier associated with the display.
   // -1 means invalid display and it doesn't not exit.
   int64 id() const { return id_; }
   void set_id(int64 id) { id_ = id; }
 
   // Gets/Sets the display's bounds in gfx::Screen's coordinates.
@@ skipping 57 matching lines @@
   Rect work_area_;
 #if defined(USE_AURA)
   Rect bounds_in_pixel_;
 #endif
   float device_scale_factor_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_DISPLAY_H_