Don't add duplicate points when clipping

cc/base/math_util.h

 // Copyright 2012 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 CC_BASE_MATH_UTIL_H_
 #define CC_BASE_MATH_UTIL_H_
 
 #include <algorithm>
 #include <cmath>
 #include <memory>
@@ skipping 292 matching lines @@
   // If the value is inf, returns max double/float representation.
   static double AsDoubleSafely(double value);
   static float AsFloatSafely(float value);
 
   // Returns vector that x axis (1,0,0) transforms to under given transform.
   static gfx::Vector3dF GetXAxis(const gfx::Transform& transform);
 
   // Returns vector that y axis (0,1,0) transforms to under given transform.
   static gfx::Vector3dF GetYAxis(const gfx::Transform& transform);
 
+  static bool IsNearlyTheSameForTesting(float left, float right);
+  static bool IsNearlyTheSameForTesting(const gfx::PointF& l,
+                                        const gfx::PointF& r);
+  static bool IsNearlyTheSameForTesting(const gfx::Point3F& l,
+                                        const gfx::Point3F& r);
+
  private:
   template <typename T>
   static T RoundUpInternal(T n, T mul) {
     return (n > 0) ? ((n + mul - 1) / mul) * mul : (n / mul) * mul;
   }
 
   template <typename T>
   static T RoundDownInternal(T n, T mul) {
     return (n > 0) ? (n / mul) * mul : (n == 0) ? 0
                                                 : ((n - mul + 1) / mul) * mul;
   }
 };
 
 class ScopedSubnormalFloatDisabler {
  public:
   ScopedSubnormalFloatDisabler();
   ~ScopedSubnormalFloatDisabler();
 
  private:
 #ifdef __SSE__
   unsigned int orig_state_;
 #endif
   DISALLOW_COPY_AND_ASSIGN(ScopedSubnormalFloatDisabler);
 };
 
 }  // namespace cc
 
 #endif  // CC_BASE_MATH_UTIL_H_