[Typed-OM] Add CSSResourceValue

third_party/WebKit/Source/core/css/cssom/CSSResourceValue.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 CSSResourceValue_h
+#define CSSResourceValue_h
+
+#include "core/css/cssom/CSSStyleValue.h"
+
+#include "core/fetch/Resource.h"
+
+namespace blink {
+
+class CORE_EXPORT CSSResourceValue : public CSSStyleValue {
+    WTF_MAKE_NONCOPYABLE(CSSResourceValue);
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    virtual ~CSSResourceValue() { }
+
+    StyleValueType type() const override { return ResourceStateType; }
+
+    const String state() const
+    {
+        switch (status()) {
+        case Resource::Status::NotStarted:
+            return "unloaded";
+        case Resource::Status::Pending:
+            return "loading";
+        case Resource::Status::Cached:
+            return "loaded";
+        case Resource::Status::LoadError:
+        case Resource::Status::DecodeError:
+            return "error";
+        default: NOTREACHED();
+        }
+    }
+
+    DEFINE_INLINE_VIRTUAL_TRACE()
+    {
+        CSSStyleValue::trace(visitor);
+    }
+
+protected:
+    CSSResourceValue() { }
+
+    virtual Resource::Status status() const = 0;
+};
+
+} // namespace blink
+
+#endif // CSSResourceValue_h