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 317 matching lines @@
   ScopedSubnormalFloatDisabler();
   ~ScopedSubnormalFloatDisabler();
 
  private:
 #ifdef __SSE__
   unsigned int orig_state_;
 #endif
   DISALLOW_COPY_AND_ASSIGN(ScopedSubnormalFloatDisabler);
 };
 
+bool IsNearlyTheSameForUnitTesting(const float left, const float right);
+bool IsNearlyTheSameForUnitTesting(const gfx::PointF& l, const gfx::PointF& r);
+bool IsNearlyTheSameForUnitTesting(const gfx::Point3F& l,
+                                   const gfx::Point3F& r);
 }  // namespace cc
 
 #endif  // CC_BASE_MATH_UTIL_H_