Fix compilation error of public/platform/WebFloatRect.h for MSVC 2013

public/platform/WebFloatRect.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 18 matching lines @@
  */
 
 #ifndef WebFloatRect_h
 #define WebFloatRect_h
 
 #include "WebCommon.h"
 
 #if BLINK_IMPLEMENTATION
 #include "platform/geometry/FloatRect.h"
 #else
+#include <algorithm>
 #include <cmath>
 #include <ui/gfx/rect_f.h>
 #endif
 
 namespace WebKit {
 
 struct WebFloatRect {
     float x;
     float y;
     float width;
@@ skipping 70 matching lines @@
 }
 
 inline bool operator!=(const WebFloatRect& a, const WebFloatRect& b)
 {
     return !(a == b);
 }
 
 } // namespace WebKit
 
 #endif