[CSS Shapes] Simplify RasterShape implementation

Source/core/rendering/shapes/ShapeInterval.h

 /*
  * Copyright (C) 2012 Adobe Systems Incorporated. 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.
@@ skipping 189 matching lines @@
 
         if (aNext != a.end()) {
             result.append(aValue);
             result.appendRange(++aNext, a.end());
         }
     }
 
     bool operator==(const ShapeInterval<T>& other) const { return x1() == other.x1() && x2() == other.x2(); }
     bool operator!=(const ShapeInterval<T>& other) const { return !operator==(other); }
 
+    void unite(const ShapeInterval<T>& interval)
+    {
+        if (interval.isEmpty())
+            return;
+        if (isEmpty())
+            set(interval.x1(), interval.x2());
+        else
+            set(std::min<T>(x1(), interval.x1()), std::max<T>(x2(), interval.x2()));
+    }
+
 private:
     T m_x1;
     T m_x2;
 
     static bool shapeIntervalsAreSortedAndDisjoint(const ShapeIntervals& intervals)
     {
         for (unsigned i = 1; i < intervals.size(); i++) {
             if (intervals[i - 1].x2() > intervals[i].x1())
                 return false;
         }
 
         return true;
     }
 };
 
 typedef ShapeInterval<int> IntShapeInterval;
 typedef ShapeInterval<float> FloatShapeInterval;
 
 typedef Vector<IntShapeInterval> IntShapeIntervals;
 typedef Vector<FloatShapeInterval> FloatShapeIntervals;
 
 } // namespace WebCore
 
 #endif // ShapeInterval_h