Web Animations: Remove CSS dependence from InterpolationType

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 InterpolationEnvironment {
+    STACK_ALLOCATED();
+public:
+    explicit InterpolationEnvironment(StyleResolverState& state)
+        : m_state(&state)
+    { }
+
+    StyleResolverState& state() { ASSERT(m_state); return *m_state; }
+    const StyleResolverState& state() const { ASSERT(m_state); return *m_state; }
+
+private:
+    StyleResolverState* m_state;
+};
+
+} // namespace blink
+
+#endif // InterpolationEnvironment_h