SVG Web Animations: Add SVGInterpolationType pipeline

third_party/WebKit/Source/core/animation/InterpolationEnvironment.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 InterpolationEnvironment_h
 #define InterpolationEnvironment_h
 
 #include "wtf/Allocator.h"
 
 namespace blink {
 
 class StyleResolverState;
+class SVGPropertyBase;
+class SVGElement;
 
 class InterpolationEnvironment {
     STACK_ALLOCATED();
 public:
     explicit InterpolationEnvironment(StyleResolverState& state)
         : m_state(&state)
+        , m_svgElement(nullptr)
+        , m_svgBaseValue(nullptr)
+    { }
+
+    explicit InterpolationEnvironment(SVGElement& svgElement, const SVGPropertyBase& svgBaseValue)
+        : m_state(nullptr)
+        , m_svgElement(&svgElement)
+        , m_svgBaseValue(&svgBaseValue)
     { }
 
     StyleResolverState& state() { ASSERT(m_state); return *m_state; }
     const StyleResolverState& state() const { ASSERT(m_state); return *m_state; }
 
+    SVGElement& svgElement() { ASSERT(m_svgElement); return *m_svgElement; }
+    const SVGElement& svgElement() const { ASSERT(m_svgElement); return *m_svgElement; }
+
+    const SVGPropertyBase& svgBaseValue() const { ASSERT(m_svgBaseValue); return *m_svgBaseValue; }
+
 private:
     StyleResolverState* m_state;
+    SVGElement* m_svgElement;
+    const SVGPropertyBase* m_svgBaseValue;
 };
 
 } // namespace blink
 
 #endif // InterpolationEnvironment_h