Move SaturatedArithmetic from Blink to base

third_party/WebKit/Source/platform/geometry/IntPoint.h

 /*
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2013 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 50 matching lines @@
   void setX(int x) { m_x = x; }
   void setY(int y) { m_y = y; }
 
   void move(const IntSize& s) { move(s.width(), s.height()); }
   void moveBy(const IntPoint& offset) { move(offset.x(), offset.y()); }
   void move(int dx, int dy) {
     m_x += dx;
     m_y += dy;
   }
   void saturatedMove(int dx, int dy) {
-    m_x = saturatedAddition(m_x, dx);
-    m_y = saturatedAddition(m_y, dy);
+    m_x = SaturatedAddition(m_x, dx);
+    m_y = SaturatedAddition(m_y, dy);
   }
 
   void scale(float sx, float sy) {
     m_x = lroundf(static_cast<float>(m_x * sx));
     m_y = lroundf(static_cast<float>(m_y * sy));
   }
 
   IntPoint expandedTo(const IntPoint& other) const {
     return IntPoint(m_x > other.m_x ? m_x : other.m_x,
                     m_y > other.m_y ? m_y : other.m_y);
@@ skipping 76 matching lines @@
 
 // Redeclared here to avoid ODR issues.
 // See platform/testing/GeometryPrinters.h.
 void PrintTo(const IntPoint&, std::ostream*);
 
 }  // namespace blink
 
 WTF_ALLOW_MOVE_INIT_AND_COMPARE_WITH_MEM_FUNCTIONS(blink::IntPoint);
 
 #endif  // IntPoint_h