Reapply the non-MathExtras parts of

Source/platform/geometry/DoublePoint.h

 // Copyright 2014 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 DoublePoint_h
 #define DoublePoint_h
 
 #include "platform/geometry/DoubleSize.h"
 #include "platform/geometry/FloatPoint.h"
 #include "platform/geometry/IntPoint.h"
@@ skipping 65 matching lines @@
     return DoubleSize(a.x() - b.x(), a.y() - b.y());
 }
 
 inline DoublePoint operator-(const DoublePoint& a)
 {
     return DoublePoint(-a.x(), -a.y());
 }
 
 inline IntPoint flooredIntPoint(const DoublePoint& p)
 {
-    return IntPoint(clampToInteger(floor(p.x())), clampToInteger(floor(p.y())));
+    return IntPoint(clampTo<int>(floor(p.x())), clampTo<int>(floor(p.y())));
 }
 
 inline FloatPoint toFloatPoint(const DoublePoint& a)
 {
     return FloatPoint(a.x(), a.y());
 }
 
 inline DoubleSize toDoubleSize(const DoublePoint& a)
 {
     return DoubleSize(a.x(), a.y());
 }
 
 }
 
 #endif