Hook up CSSPaintValue::image to CSS Paint API callback.

third_party/WebKit/Source/core/css/CSSPaintImageGenerator.cpp

+// 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.
+
+#include "core/css/CSSPaintImageGenerator.h"
+
+namespace blink {
+
+namespace {
+
+CSSPaintImageGenerator::CSSPaintImageGeneratorCreateFunction s_createFunction = nullptr;
+
+} // namespace
+
+// static
+void CSSPaintImageGenerator::init(CSSPaintImageGeneratorCreateFunction createFunction)
+{
+    ASSERT(!s_createFunction);
+    s_createFunction = createFunction;
+}
+
+// static
+CSSPaintImageGenerator* CSSPaintImageGenerator::create(const String& name, Document& document, Observer* observer)
+{
+    ASSERT(s_createFunction);
+    return s_createFunction(name, document, observer);
+}
+
+CSSPaintImageGenerator::~CSSPaintImageGenerator()
+{
+}
+
+} // namespace blink