Remove most content from Interpolation

third_party/WebKit/Source/core/animation/Interpolation.cpp

-// Copyright 2014 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.
-
-#include "core/animation/Interpolation.h"
-
-#include <memory>
-
-namespace blink {
-
-namespace {
-
-bool typesMatch(const InterpolableValue* start, const InterpolableValue* end) {
-  if (start == end)
-    return true;
-  if (start->isNumber())
-    return end->isNumber();
-  if (start->isBool())
-    return end->isBool();
-  if (start->isAnimatableValue())
-    return end->isAnimatableValue();
-  if (!(start->isList() && end->isList()))
-    return false;
-  const InterpolableList* startList = toInterpolableList(start);
-  const InterpolableList* endList = toInterpolableList(end);
-  if (startList->length() != endList->length())
-    return false;
-  for (size_t i = 0; i < startList->length(); ++i) {
-    if (!typesMatch(startList->get(i), endList->get(i)))
-      return false;
-  }
-  return true;
-}
-
-}  // namespace
-
-Interpolation::Interpolation(std::unique_ptr<InterpolableValue> start,
-                             std::unique_ptr<InterpolableValue> end)
-    : m_start(std::move(start)),
-      m_end(std::move(end)),
-      m_cachedFraction(0),
-      m_cachedIteration(0),
-      m_cachedValue(m_start ? m_start->clone() : nullptr) {
-  RELEASE_ASSERT(typesMatch(m_start.get(), m_end.get()));
-}
-
-Interpolation::~Interpolation() {}
-
-void Interpolation::interpolate(int iteration, double fraction) {
-  if (m_cachedFraction != fraction || m_cachedIteration != iteration) {
-    m_start->interpolate(*m_end, fraction, *m_cachedValue);
-    m_cachedIteration = iteration;
-    m_cachedFraction = fraction;
-  }
-}
-
-}  // namespace blink