[WIP] Plumbing for paint

third_party/WebKit/Source/modules/csspaint/CSSPaintDefinition.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 CSSPaintDefinition_h
+#define CSSPaintDefinition_h
+
+#include "bindings/core/v8/ScopedPersistent.h"
+#include "platform/geometry/IntSize.h"
+#include "platform/heap/Handle.h"
+#include <v8.h>
+
+namespace blink {
+
+class Image;
+class ScriptState;
+
+class CSSPaintDefinition final : public RefCountedWillBeGarbageCollectedFinalized<CSSPaintDefinition> {
+public:
+    static PassRefPtrWillBeRawPtr<CSSPaintDefinition> create(ScriptState*, v8::Local<v8::Function> constructor, v8::Local<v8::Function> paint);
+    virtual ~CSSPaintDefinition();
+
+    void initialize(v8::Local<v8::Function> constructor, v8::Local<v8::Function> paint);
+
+    PassRefPtr<Image> paint(const IntSize&);
+
+    DEFINE_INLINE_TRACE() { };
+
+private:
+    CSSPaintDefinition(ScriptState*, v8::Local<v8::Function> constructor, v8::Local<v8::Function> paint);
+
+    v8::Local<v8::Object> paintInstance();
+
+    RefPtr<ScriptState> m_scriptState;
+
+    ScopedPersistent<v8::Function> m_constructor;
+    ScopedPersistent<v8::Function> m_paint;
+
+    // At the moment there is only ever one instance of a paint class per type
+    // so we store it here. If this changes, instance should be passed into the
+    // callback. m_instance is lazily constructed.
+    ScopedPersistent<v8::Object> m_instance;
+};
+
+} // namespace blink
+
+#endif // CSSPaintDefinition_h