Prepare ui/ module for compilation with OS X 10.7 deployment target.

ui/base/cocoa/cocoa_base_utils.mm

 // Copyright 2014 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/base/cocoa/cocoa_base_utils.h"
 
 #include "ui/events/cocoa/cocoa_event_utils.h"
 
 namespace ui {
 
 WindowOpenDisposition WindowOpenDispositionFromNSEvent(NSEvent* event) {
   NSUInteger modifiers = [event modifierFlags];
   return WindowOpenDispositionFromNSEventWithFlags(event, modifiers);
 }
 
 WindowOpenDisposition WindowOpenDispositionFromNSEventWithFlags(
     NSEvent* event, NSUInteger modifiers) {
   int event_flags = EventFlagsFromNSEventWithModifiers(event, modifiers);
   return DispositionFromEventFlags(event_flags);
 }
 
+NSPoint ConvertPointFromWindowToScreen(NSWindow* window, NSPoint point) {
+  NSRect point_rect = NSMakeRect(point.x, point.y, 0, 0);
+  return [window convertRectToScreen:point_rect].origin;
+}
+
+NSPoint ConvertPointFromScreenToWindow(NSWindow* window, NSPoint point) {
+  NSRect point_rect = NSMakeRect(point.x, point.y, 0, 0);
+  return [window convertRectFromScreen:point_rect].origin;
+}
+
 }  // namespace ui