Minor Gradient cleanup.

Source/platform/graphics/Gradient.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * 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.
@@ skipping 50 matching lines @@
     , m_stopsSorted(false)
     , m_drawInPMColorSpace(false)
     , m_spreadMethod(SpreadMethodPad)
 {
 }
 
 Gradient::~Gradient()
 {
 }
 
-void Gradient::addColorStop(float value, const Color& color)
-{
-    m_stops.append(ColorStop(value, color));
-
-    m_stopsSorted = false;
-    m_gradient.clear();
-}
-
-void Gradient::addColorStop(const Gradient::ColorStop& stop)
-{
-    m_stops.append(stop);
-
-    m_stopsSorted = false;
-    m_gradient.clear();
-}
-
 static inline bool compareStops(const Gradient::ColorStop& a, const Gradient::ColorStop& b)
 {
     return a.stop < b.stop;
 }
 
+void Gradient::addColorStop(const Gradient::ColorStop& stop)
+{
+    if (m_stops.isEmpty()) {
+        m_stopsSorted = true;
+    } else {
+        m_stopsSorted = m_stopsSorted && compareStops(m_stops.last(), stop);
+    }
+
+    m_stops.append(stop);
+    m_gradient.clear();
+}
+
 void Gradient::sortStopsIfNecessary()
 {
     if (m_stopsSorted)
         return;
 
     m_stopsSorted = true;
 
     if (!m_stops.size())
         return;
 
@@ skipping 162 matching lines @@
     if (!m_gradient) {
         // use last color, since our "geometry" was degenerate (e.g. radius==0)
         m_gradient = adoptRef(new SkColorShader(colors[countUsed - 1]));
     } else {
         m_gradient->setLocalMatrix(affineTransformToSkMatrix(m_gradientSpaceTransformation));
     }
     return m_gradient.get();
 }
 
 } //namespace