[Mac] Add gfx::ScreenPoint[To|From]NSPoint.

ui/gfx/mac/coordinate_conversion.h

Index: ui/gfx/mac/coordinate_conversion.h
diff --git a/ui/gfx/mac/coordinate_conversion.h b/ui/gfx/mac/coordinate_conversion.h
index 3deec9a94767d9aee4544bb6386048584eab827b..3b75485357b72d3ad6aff7a1e220000bebd30201 100644
--- a/ui/gfx/mac/coordinate_conversion.h
+++ b/ui/gfx/mac/coordinate_conversion.h
@@ -11,15 +11,24 @@
 
 namespace gfx {
 
+class Point;
 class Rect;
 
 // Convert a gfx::Rect specified with the origin at the top left of the primary
 // display into AppKit secreen coordinates (origin at the bottom left).
-GFX_EXPORT NSRect ScreenRectToNSRect(const gfx::Rect& rect);
+GFX_EXPORT NSRect ScreenRectToNSRect(const Rect& rect);
 
 // Convert an AppKit NSRect with origin in the bottom left of the primary
 // display into a gfx::Rect with origin at the top left of the primary display.
-GFX_EXPORT gfx::Rect ScreenRectFromNSRect(const NSRect& point);
+GFX_EXPORT Rect ScreenRectFromNSRect(const NSRect& point);
+
+// Convert a gfx::Point specified with the origin at the top left of the primary
+// display into AppKit screen coordinates (origin at the bottom left).
+GFX_EXPORT NSPoint ScreenPointToNSPoint(const Point& point);
+
+// Convert an AppKit NSPoint with origin in the bottom left of the primary
+// display into a gfx::Point with origin at the top left of the primary display.
+GFX_EXPORT Point ScreenPointFromNSPoint(const NSPoint& point);
 
 }  // namespace gfx