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

ui/gfx/point.cc

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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.
 
 #include "ui/gfx/point.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
-#include <ostream>
+#include "base/stringprintf.h"
 
 namespace gfx {
 
 Point::Point() : x_(0), y_(0) {
 }
 
 Point::Point(int x, int y) : x_(x), y_(y) {
 }
 
 #if defined(OS_WIN)
@@ skipping 20 matching lines @@
 }
 #elif defined(OS_MACOSX)
 Point::Point(const CGPoint& point) : x_(point.x), y_(point.y) {
 }
 
 CGPoint Point::ToCGPoint() const {
   return CGPointMake(x_, y_);
 }
 #endif
 
-std::ostream& operator<<(std::ostream& out, const gfx::Point& p) {
-  return out << p.x() << "," << p.y();
+std::string Point::ToString() const {
+  return base::StringPrintf("%d,%d", x_, y_);
 }
 
 }  // namespace gfx