[css-ui] Make caret-color animatable

third_party/WebKit/Source/core/css/StyleAutoColor.h

 // Copyright 2016 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 StyleAutoColor_h
 #define StyleAutoColor_h
 
 #include "core/css/StyleColor.h"
 #include "platform/graphics/Color.h"
 #include "wtf/Allocator.h"
@@ skipping 16 matching lines @@
   Color color() const {
     DCHECK(m_type == ValueType::SpecifiedColor);
     return m_color;
   }
 
   Color resolve(Color currentColor) const {
     return m_type == ValueType::SpecifiedColor ? m_color : currentColor;
   }
 
   StyleColor toStyleColor() const {
+    DCHECK(m_type != ValueType::Auto);
     if (m_type == ValueType::SpecifiedColor)
       return StyleColor(m_color);
+    DCHECK(m_type == ValueType::CurrentColor);
     return StyleColor::currentColor();
   }
 
  private:
   enum class ValueType { Auto, CurrentColor, SpecifiedColor };
   StyleAutoColor(ValueType type) : m_type(type) {}
 
   ValueType m_type;
   Color m_color;
 };
 
 inline bool operator==(const StyleAutoColor& a, const StyleAutoColor& b) {
   if (a.isAutoColor() || b.isAutoColor())
     return a.isAutoColor() && b.isAutoColor();
   if (a.isCurrentColor() || b.isCurrentColor())
     return a.isCurrentColor() && b.isCurrentColor();
   return a.color() == b.color();
 }
 
 inline bool operator!=(const StyleAutoColor& a, const StyleAutoColor& b) {
   return !(a == b);
 }
 
 }  // namespace blink
 
 #endif  // StyleAutoColor_h