Hookup device dpi for ChromeOS

ash/display/display_info.h

 // 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.
 
 #ifndef ASH_DISPLAY_DISPLAY_INFO_H_
 #define ASH_DISPLAY_DISPLAY_INFO_H_
 
 #include <map>
 #include <string>
 #include <vector>
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   // Clear the list of input devices associated with this display.
   void ClearInputDevices();
 
   // The input device ids that are associated with this display.
   std::vector<int> input_devices() const { return input_devices_; }
 
   // Gets/Sets the device scale factor of the display.
   float device_scale_factor() const { return device_scale_factor_; }
   void set_device_scale_factor(float scale) { device_scale_factor_ = scale; }
 
+  // Gets/Sets the device DPI of the display.
+  float device_dpi() const { return device_dpi_; }
+  void set_device_dpi(float dpi) { device_dpi_ = dpi; }
+
   // The native bounds for the display. The size of this can be
   // different from the |size_in_pixel| when overscan insets are set
   // and/or |configured_ui_scale_| is set.
   const gfx::Rect& bounds_in_native() const {
     return bounds_in_native_;
   }
 
   // The size for the display in pixels.
   const gfx::Size& size_in_pixel() const { return size_in_pixel_; }
 
@@ skipping 118 matching lines @@
   std::vector<int> input_devices_;
 
   // This specifies the device's pixel density. (For example, a
   // display whose DPI is higher than the threshold is considered to have
   // device_scale_factor = 2.0 on Chrome OS).  This is used by the
   // grapics layer to choose and draw appropriate images and scale
   // layers properly.
   float device_scale_factor_;
   gfx::Rect bounds_in_native_;
 
+  // This specifies the device's DPI.
+  float device_dpi_;
+
   // The size of the display in use. The size can be different from the size
   // of |bounds_in_native_| if the display has overscan insets and/or rotation.
   gfx::Size size_in_pixel_;
   gfx::Insets overscan_insets_in_dip_;
 
   // The pixel scale of the display. This is used to simply expand (or
   // shrink) the desktop over the native display resolution (useful in
   // HighDPI display).  Note that this should not be confused with the
   // device scale factor, which specifies the pixel density of the
   // display. The actuall scale value to be used depends on the device
@@ skipping 24 matching lines @@
   // If you add a new member, you need to update Copy().
 };
 
 // Resets the synthesized display id for testing. This
 // is necessary to avoid overflowing the output index.
 ASH_EXPORT void ResetDisplayIdForTest();
 
 }  // namespace ash
 
 #endif  //  ASH_DISPLAY_DISPLAY_INFO_H_