Clean up stale FIXMEs and TODOs in core/animation

third_party/WebKit/Source/core/animation/PrimitiveInterpolation.h

 // Copyright 2015 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 PrimitiveInterpolation_h
 #define PrimitiveInterpolation_h
 
 #include "core/animation/TypedInterpolationValue.h"
 #include "platform/animation/AnimationUtilities.h"
 #include "platform/heap/Handle.h"
@@ skipping 78 matching lines @@
 
 private:
     FlipPrimitiveInterpolation(std::unique_ptr<TypedInterpolationValue> start, std::unique_ptr<TypedInterpolationValue> end)
         : m_start(std::move(start))
         , m_end(std::move(end))
         , m_lastFraction(std::numeric_limits<double>::quiet_NaN())
     { }
 
     void interpolateValue(double fraction, std::unique_ptr<TypedInterpolationValue>& result) const final
     {
-        // TODO(alancutter): Remove this optimisation once Oilpan is default.

[alancutter (OOO until 2018), 2016/09/27 01:14:14]

InterpolationValues are no longer garbage collected, optimisation remains
useful.

         if (!std::isnan(m_lastFraction) && (fraction < 0.5) == (m_lastFraction < 0.5))
             return;
         const TypedInterpolationValue* side = ((fraction < 0.5) ? m_start : m_end).get();
         result = side ? side->clone() : nullptr;
         m_lastFraction = fraction;
     }
 
     double interpolateUnderlyingFraction(double start, double end, double fraction) const final { return fraction < 0.5 ? start : end; }
 
     bool isFlip() const final { return true; }
 
     std::unique_ptr<TypedInterpolationValue> m_start;
     std::unique_ptr<TypedInterpolationValue> m_end;
     mutable double m_lastFraction;
 };
 
 } // namespace blink
 
 #endif // PrimitiveInterpolation_h