Introducing SurfaceReferenceFactory

cc/surfaces/surface_embedding_base.cc

+// Copyright (c) 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 "cc/surfaces/surface_embedding_base.h"
+
+namespace cc {
+
+void SurfaceRef::Destroy() {
+  if (!factory_)
+    return;
+  factory_->DestroyReference(this);
+  factory_ = nullptr;
+}
+
+void SurfaceRef::Destroy(CompositorFrameMetadata* metadata) {
+  if (!factory_)
+    return;
+  factory_->DestroyReference(this, metadata);
+  factory_ = nullptr;
+}
+
+bool SurfaceRef::IsDestroyed() const {
+  return factory_ == nullptr;
+}
+
+SurfaceRef::~SurfaceRef() {
+  Destroy();
+}
+
+SurfaceRef::SurfaceRef(const SurfaceEmbedding* factory) : factory_(factory) {}
+
+SequenceSurfaceRef::SequenceSurfaceRef(const SurfaceEmbedding* factory,
+                                       const SurfaceSequence& seq)
+    : SurfaceRef(factory), seq_(seq) {}
+
+}  // namespace cc