MacViews: Implement capture using NSEvent local+global monitors

ui/gfx/mac/coordinate_conversion.h

 // 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.
 
 #ifndef UI_GFX_MAC_COORDINATE_CONVERSION_H_
 #define UI_GFX_MAC_COORDINATE_CONVERSION_H_
 
 #import <Foundation/Foundation.h>
 
 #include "ui/gfx/gfx_export.h"
 
 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).
+// display into AppKit screen coordinates (origin at the bottom left).
 GFX_EXPORT NSRect ScreenRectToNSRect(const gfx::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 gfx::Rect ScreenRectFromNSRect(const NSRect& rect);
+
+// 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 gfx::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 gfx::Point ScreenPointFromNSPoint(const NSPoint& point);
 
 }  // namespace gfx
 
 #endif  // UI_GFX_MAC_COORDINATE_CONVERSION_H_