Make adding and subtracting gfx:: point types simpler.

ui/gfx/point.h

Index: ui/gfx/point.h
diff --git a/ui/gfx/point.h b/ui/gfx/point.h
index dfb227d190eb22afb01371d9f2ba35e12969bf27..4bf9d55e354ee3ba5a3e4bcf1cd8227cb931e9bb 100644
--- a/ui/gfx/point.h
+++ b/ui/gfx/point.h
@@ -7,6 +7,7 @@
 
 #include "ui/base/ui_export.h"
 #include "ui/gfx/point_base.h"
+#include "ui/gfx/point_f.h"
 
 #if defined(OS_WIN)
 typedef unsigned long DWORD;
@@ -43,10 +44,22 @@ class UI_EXPORT Point : public PointBase<Point, int> {
   CGPoint ToCGPoint() const;
 #endif
 
+  PointF ToPointF() const {
+    return PointF(x(), y());
+  }
+
   // Returns a string representation of point.
   std::string ToString() const;
 };
 
+inline Point operator+(Point lhs, Point rhs) {
+  return lhs.Add(rhs);
+}
+
+inline Point operator-(Point lhs, Point rhs) {
+  return lhs.Subtract(rhs);
+}
+
 #if !defined(COMPILER_MSVC)
 extern template class PointBase<Point, int>;
 #endif