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

ui/base/cocoa/cocoa_base_utils.mm

Index: ui/base/cocoa/cocoa_base_utils.mm
diff --git a/ui/base/cocoa/cocoa_base_utils.mm b/ui/base/cocoa/cocoa_base_utils.mm
index 0830f3488a8bddb2f8708155cb562838fda0c21a..cf25604f21ef286655d418056881d088570ae72c 100644
--- a/ui/base/cocoa/cocoa_base_utils.mm
+++ b/ui/base/cocoa/cocoa_base_utils.mm
@@ -19,4 +19,14 @@ WindowOpenDisposition WindowOpenDispositionFromNSEventWithFlags(
   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