WIP: Implement CSS transitions on top of InterpolationTypes instead of AnimatableValues

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

Index: third_party/WebKit/Source/core/animation/StyleInterpolation.h
diff --git a/third_party/WebKit/Source/core/animation/StyleInterpolation.h b/third_party/WebKit/Source/core/animation/StyleInterpolation.h
index 3317039d022538c1000a41316a09a274877f06dd..03db5f69f23cf77b37c0e39dbc5acbffbf676cfc 100644
--- a/third_party/WebKit/Source/core/animation/StyleInterpolation.h
+++ b/third_party/WebKit/Source/core/animation/StyleInterpolation.h
@@ -15,17 +15,6 @@ namespace blink {
 
 class StyleResolverState;
 
-enum InterpolationRange {
-    RangeAll,
-    RangeFloor,
-    RangeGreaterThanOrEqualToOne,
-    RangeNonNegative,
-    RangeRound,
-    RangeRoundGreaterThanOrEqualToOne,
-    RangeOpacityFIXME,
-    RangeZeroToOne
-};
-
 class CORE_EXPORT StyleInterpolation : public Interpolation {
 public:
     // 1) convert m_cachedValue into an X
@@ -46,13 +35,21 @@ public:
     }
 
 protected:
-    CSSPropertyID m_id;
+    StyleInterpolation(std::unique_ptr<InterpolableValue> start, std::unique_ptr<InterpolableValue> end, CSSPropertyID);
 
-    StyleInterpolation(std::unique_ptr<InterpolableValue> start, std::unique_ptr<InterpolableValue> end, CSSPropertyID id)
-        : Interpolation(std::move(start), std::move(end))
-        , m_id(id)
-    {
-    }
+    void interpolateImpl() final;
+
+    const std::unique_ptr<InterpolableValue> m_start;
+    const std::unique_ptr<InterpolableValue> m_end;
+    const CSSPropertyID m_id;
+
+    mutable std::unique_ptr<InterpolableValue> m_cachedValue;
+
+private:
+    InterpolableValue* getCachedValueForTesting() const { return m_cachedValue.get(); }
+
+    friend class AnimationInterpolableValueTest;
+    friend class AnimationInterpolationEffectTest;
 };
 
 DEFINE_TYPE_CASTS(StyleInterpolation, Interpolation, value, value->isStyleInterpolation(), value.isStyleInterpolation());