Use MAKEPOINTS instead of GET_X/Y_LPARAM to reduce a dependency on ATL....

base/gfx/point.h

 // Copyright (c) 2006-2008 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 BASE_GFX_POINT_H__
 #define BASE_GFX_POINT_H__
 
 #include "build/build_config.h"
 
 #include <iosfwd>
 
 #if defined(OS_WIN)
+typedef unsigned long DWORD;
 typedef struct tagPOINT POINT;
 #elif defined(OS_MACOSX)
 #include <ApplicationServices/ApplicationServices.h>
 #endif
 
 namespace gfx {
 
 //
 // A point has an x and y coordinate.
 //
 class Point {
  public:
   Point();
   Point(int x, int y);
 #if defined(OS_WIN)
+  // |point| is a DWORD value that contains a coordinate.  The x-coordinate is
+  // the low-order short and the y-coordinate is the high-order short.  This
+  // value is commonly acquired from GetMessagePos/GetCursorPos.
+  explicit Point(DWORD point);
   explicit Point(const POINT& point);
   Point& operator=(const POINT& point);
 #elif defined(OS_MACOSX)
   explicit Point(const CGPoint& point);
 #endif
 
   ~Point() {}
 
   int x() const { return x_; }
   int y() const { return y_; }
@@ skipping 27 matching lines @@
 
  private:
   int x_;
   int y_;
 };
 
 }  // namespace gfx
 
 std::ostream& operator<<(std::ostream& out, const gfx::Point& p);
 
-#endif // BASE_GFX_POINT_H__
+#endif  // BASE_GFX_POINT_H__