[SPv2] Add createOpacityOnlyEffect test helper

third_party/WebKit/Source/platform/testing/PaintPropertyTestHelpers.h

Index: third_party/WebKit/Source/platform/testing/PaintPropertyTestHelpers.h
diff --git a/third_party/WebKit/Source/platform/testing/PaintPropertyTestHelpers.h b/third_party/WebKit/Source/platform/testing/PaintPropertyTestHelpers.h
new file mode 100644
index 0000000000000000000000000000000000000000..8a74c398ba7e386153ff1d71e718ba6e376f03fb
--- /dev/null
+++ b/third_party/WebKit/Source/platform/testing/PaintPropertyTestHelpers.h
@@ -0,0 +1,36 @@
+// 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 "platform/graphics/paint/ClipPaintPropertyNode.h"
+#include "platform/graphics/paint/EffectPaintPropertyNode.h"
+#include "platform/graphics/paint/PaintChunkProperties.h"
+#include "platform/graphics/paint/ScrollPaintPropertyNode.h"
+#include "platform/graphics/paint/TransformPaintPropertyNode.h"
+
+namespace blink {
+namespace testing {
+
+static inline PassRefPtr<EffectPaintPropertyNode> createOpacityOnlyEffect(
+    PassRefPtr<const EffectPaintPropertyNode> parent,
+    float opacity) {
+  RefPtr<TransformPaintPropertyNode> localTransformSpace =
+      const_cast<TransformPaintPropertyNode*>(parent->localTransformSpace());
+  RefPtr<ClipPaintPropertyNode> outputClip =
+      const_cast<ClipPaintPropertyNode*>(parent->outputClip());
+  return EffectPaintPropertyNode::create(
+      std::move(parent), std::move(localTransformSpace), std::move(outputClip),
+      CompositorFilterOperations(), opacity);
+}
+
+static inline PaintChunkProperties defaultPaintChunkProperties() {
+  PaintChunkProperties defaultProperties;
+  defaultProperties.transform = TransformPaintPropertyNode::root();
+  defaultProperties.clip = ClipPaintPropertyNode::root();
+  defaultProperties.effect = EffectPaintPropertyNode::root();
+  defaultProperties.scroll = ScrollPaintPropertyNode::root();
+  return defaultProperties;
+}
+
+}  // namespace testing
+}  // namespace blink