Convert GetPreferredSize from:...

base/gfx/size.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_SIZE_H__
 #define BASE_GFX_SIZE_H__
 
 #include "build/build_config.h"
 
 #ifdef UNIT_TEST
@@ skipping 19 matching lines @@
   ~Size() {}
 
   int width() const { return width_; }
   int height() const { return height_; }
 
   void SetSize(int width, int height) {
     width_ = width;
     height_ = height;
   }
 
+  void Enlarge(int width, int height) {
+    width_ += width;
+    height_ += height;
+  }
+
   void set_width(int width) { width_ = width; }
   void set_height(int height) { height_ = height; }
 
   bool operator==(const Size& s) const {
     return width_ == s.width_ && height_ == s.height_;
   }
 
   bool operator!=(const Size& s) const {
     return !(*this == s);
   }
@@ skipping 18 matching lines @@
 #ifdef UNIT_TEST
 
 inline std::ostream& operator<<(std::ostream& out, const gfx::Size& s) {
   return out << s.width() << "x" << s.height();
 }
 
 #endif  // #ifdef UNIT_TEST
 
 #endif // BASE_GFX_SIZE_H__