Enable subpixel positioning for internal display with dsf larger than 1.0

ash/display/display_manager.h

Index: ash/display/display_manager.h
diff --git a/ash/display/display_manager.h b/ash/display/display_manager.h
index 9c57fde21ab1dd5fc03e5ac41efcdc4c8eab625e..4be4bbd3977df4de02b5e1d489131682deca9c39 100644
--- a/ash/display/display_manager.h
+++ b/ash/display/display_manager.h
@@ -122,6 +122,10 @@ class ASH_EXPORT DisplayManager
   // Initialize default display.
   void InitDefaultDisplay();
 
+  // Initializes font related params that depends on display
+  // configuration.
+  void InitFontParams();
+
   // True if the given |display| is currently connected.
   bool IsActiveDisplay(const gfx::Display& display) const;