Add gfx::Screen::IsEnabled()

ui/gfx/screen_mac.mm

 // 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.
 
 #include "ui/gfx/screen.h"
 
 #import <ApplicationServices/ApplicationServices.h>
 #import <Cocoa/Cocoa.h>
 
 @interface NSScreen (LionAPI)
@@ skipping 57 matching lines @@
     scale = [screen userSpaceScaleFactor];
   monitor.set_device_scale_factor(scale);
   return monitor;
 }
 
 }  // namespace
 
 namespace gfx {
 
 // static
+bool Screen::IsDIPEnabled() {
+  return false;
+}
+
+// static
 gfx::Point Screen::GetCursorScreenPoint() {
   NSPoint mouseLocation  = [NSEvent mouseLocation];
   // Flip coordinates to gfx (0,0 in top-left corner) using primary screen.
   NSScreen* screen = [[NSScreen screens] objectAtIndex:0];
   mouseLocation.y = NSMaxY([screen frame]) - mouseLocation.y;
   return gfx::Point(mouseLocation.x, mouseLocation.y);
 }
 
 // static
 gfx::Monitor Screen::GetPrimaryMonitor() {
@@ skipping 39 matching lines @@
       // The primary display in a mirrored set will be counted, but those that
       // mirror it will not be.
       ++display_count;
     }
   }
 
   return display_count;
 }
 
 }  // namespace gfx