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

ui/gfx/rect.h

 // 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.
 
 // Defines a simple integer rectangle class.  The containment semantics
 // are array-like; that is, the coordinate (x, y) is considered to be
 // contained by the rectangle, but the coordinate (x + width, y) is not.
 // The class will happily let you create malformed rectangles (that is,
 // rectangles with negative width and/or height), but there will be assertions
 // in the operations (such as Contains()) to complain in this case.
 
 #ifndef UI_GFX_RECT_H_
 #define UI_GFX_RECT_H_
 #pragma once
 
-#include <iosfwd>
+#include <string>
 
 #include "ui/gfx/point.h"
 #include "ui/gfx/size.h"
 
 #if defined(OS_WIN)
 typedef struct tagRECT RECT;
 #elif defined(TOOLKIT_USES_GTK)
 typedef struct _GdkRectangle GdkRectangle;
 #endif
 
@@ skipping 16 matching lines @@
   explicit Rect(const CGRect& r);
 #elif defined(TOOLKIT_USES_GTK)
   explicit Rect(const GdkRectangle& r);
 #endif
 #if defined(USE_WAYLAND)
   explicit Rect(const cairo_rectangle_int_t& r);
 #endif
   explicit Rect(const gfx::Size& size);
   Rect(const gfx::Point& origin, const gfx::Size& size);
 
-  ~Rect() {}
+  ~Rect();
 
 #if defined(OS_WIN)
   Rect& operator=(const RECT& r);
 #elif defined(OS_MACOSX)
   Rect& operator=(const CGRect& r);
 #elif defined(TOOLKIT_USES_GTK)
   Rect& operator=(const GdkRectangle& r);
 #endif
 #if defined(USE_WAYLAND)
   Rect& operator=(const cairo_rectangle_int_t& r);
@@ skipping 114 matching lines @@
   Point CenterPoint() const;
 
   // Return a rectangle that has the same center point but with a size capped
   // at given |size|.
   Rect Center(const gfx::Size& size) const;
 
   // Returns true if this rectangle shares an entire edge (i.e., same width or
   // same height) with the given rectangle, and the rectangles do not overlap.
   bool SharesEdgeWith(const gfx::Rect& rect) const;
 
+  std::string ToString() const;
+
  private:
   gfx::Point origin_;
   gfx::Size size_;
 };
 
-UI_EXPORT std::ostream& operator<<(std::ostream& out, const gfx::Rect& r);
-
 }  // namespace gfx
 
 #endif  // UI_GFX_RECT_H_