ui/gfx: Add ToString() function to Point class.

ui/gfx/point.h

Index: ui/gfx/point.h
diff --git a/ui/gfx/point.h b/ui/gfx/point.h
index a290f593b56b65f08f5ec70c4acf480cd179a130..5f2a3d42287b8b1fd30fa7aa4f2f4fc7a0e5a564 100644
--- a/ui/gfx/point.h
+++ b/ui/gfx/point.h
@@ -6,10 +6,9 @@
 #define UI_GFX_POINT_H_
 #pragma once
 
-#include "build/build_config.h"
-
-#include <iosfwd>
+#include <string>
 
+#include "build/build_config.h"
 #include "ui/base/ui_export.h"
 
 #if defined(OS_WIN)
@@ -91,13 +90,14 @@ class UI_EXPORT Point {
   CGPoint ToCGPoint() const;
 #endif
 
+  // Returns a string representation of point.
+  std::string ToString() const;
+
  private:
   int x_;
   int y_;
 };
 
-UI_EXPORT std::ostream& operator<<(std::ostream& out, const gfx::Point& p);
-
 }  // namespace gfx
 
 #endif  // UI_GFX_POINT_H_