Make PropertyHandle instances const references where possible

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

 // Copyright 2017 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/LegacyStyleInterpolation.h"
 
 #include <memory>
 
 namespace blink {
 
@@ skipping 23 matching lines @@
 
 }  // namespace
 
 LegacyStyleInterpolation::LegacyStyleInterpolation(
     std::unique_ptr<InterpolableValue> start,
     std::unique_ptr<InterpolableValue> end,
     CSSPropertyID id)
     : Interpolation(),
       m_start(std::move(start)),
       m_end(std::move(end)),
-      m_id(id),
+      m_property(id),
       m_cachedFraction(0),
       m_cachedIteration(0),
       m_cachedValue(m_start ? m_start->clone() : nullptr) {
   RELEASE_ASSERT(typesMatch(m_start.get(), m_end.get()));
 }
 
 void LegacyStyleInterpolation::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