Web Animations: Add Interpolation class.

Source/core/animation/InterpolableValue.h

 // 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.
 
 #ifndef InterpolableValue_h
 #define InterpolableValue_h
 
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace WebCore {
 
 class InterpolableValue {
 public:
     virtual bool isNumber() const { return false; }
     virtual bool isBool() const { return false; }
     virtual bool isList() const { return false; }
 
     virtual ~InterpolableValue() { }
     virtual PassOwnPtr<InterpolableValue> clone() const = 0;
 
 private:
     virtual PassOwnPtr<InterpolableValue> interpolate(const InterpolableValue &to, const double progress) const = 0;
 
-    // TODO: Replace this with Interpolation when committing Interpolation
-    // patch. Refactor InterpolableValueTest to test via Interpolation
-    // interface.
-    friend class AnimationInterpolableValueTest;
+    friend class Interpolation;
 
     // Keep interpolate private, but allow calls within the hierarchy without
     // knowledge of type.
     friend class InterpolableNumber;
     friend class InterpolableBool;
     friend class InterpolableList;
 };
 
 class InterpolableNumber : public InterpolableValue {
 public:
@@ skipping 53 matching lines @@
     void set(size_t position, PassOwnPtr<InterpolableValue> value)
     {
         ASSERT(position < m_size);
         m_values.get()[position] = value;
     }
     const InterpolableValue* get(size_t position) const
     {
         ASSERT(position < m_size);
         return m_values.get()[position].get();
     }
+    size_t length() const { return m_size; }
     virtual PassOwnPtr<InterpolableValue> clone() const OVERRIDE FINAL { return create(*this); }
 
 private:
     virtual PassOwnPtr<InterpolableValue> interpolate(const InterpolableValue &other, const double progress) const OVERRIDE FINAL;
     InterpolableList(size_t size)
         : m_size(size)
     {
         m_values = adoptArrayPtr(new OwnPtr<InterpolableValue>[size]);
     }
 
     InterpolableList(const InterpolableList& other)
         : m_size(other.m_size)
     {
         m_values = adoptArrayPtr(new OwnPtr<InterpolableValue>[m_size]);
         for (size_t i = 0; i < m_size; i++)
             set(i, other.m_values.get()[i]->clone());
     }
 
     size_t m_size;
     OwnPtr<OwnPtr<InterpolableValue>[]> m_values;
 };
 
 DEFINE_TYPE_CASTS(InterpolableNumber, InterpolableValue, value, value->isNumber(), value.isNumber());
 DEFINE_TYPE_CASTS(InterpolableBool, InterpolableValue, value, value->isBool(), value.isBool());
 DEFINE_TYPE_CASTS(InterpolableList, InterpolableValue, value, value->isList(), value.isList());
 
 }
 
 #endif