Add ComputedStyle constructor and getter to InterpolationEnvironment

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 "platform/heap/Handle.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
+class ComputedStyle;
 class StyleResolverState;
 class SVGPropertyBase;
 class SVGElement;
 
 class InterpolationEnvironment {
     STACK_ALLOCATED();
 public:
-    explicit InterpolationEnvironment(StyleResolverState& state)
-        : m_state(&state)
+    explicit InterpolationEnvironment(const ComputedStyle& style)
+        : m_state(nullptr)
+        , m_style(&style)
         , m_svgElement(nullptr)
         , m_svgBaseValue(nullptr)
     { }
 
+    explicit InterpolationEnvironment(StyleResolverState&);
+
     explicit InterpolationEnvironment(SVGElement& svgElement, const SVGPropertyBase& svgBaseValue)
         : m_state(nullptr)
+        , m_style(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; }
+    StyleResolverState& state() { DCHECK(m_state); return *m_state; }
+    const StyleResolverState& state() const { DCHECK(m_state); return *m_state; }
 
-    SVGElement& svgElement() { ASSERT(m_svgElement); return *m_svgElement; }
-    const SVGElement& svgElement() const { ASSERT(m_svgElement); return *m_svgElement; }
+    ComputedStyle& style();
+    const ComputedStyle& style() const { DCHECK(m_style); return *m_style; }
 
-    const SVGPropertyBase& svgBaseValue() const { ASSERT(m_svgBaseValue); return *m_svgBaseValue; }
+    SVGElement& svgElement() { DCHECK(m_svgElement); return *m_svgElement; }
+    const SVGElement& svgElement() const { DCHECK(m_svgElement); return *m_svgElement; }
+
+    const SVGPropertyBase& svgBaseValue() const { DCHECK(m_svgBaseValue); return *m_svgBaseValue; }
 
 private:
     StyleResolverState* m_state;
+    const ComputedStyle* m_style;
     Member<SVGElement> m_svgElement;
     Member<const SVGPropertyBase> m_svgBaseValue;
 };
 
 } // namespace blink
 
 #endif // InterpolationEnvironment_h