Introducing SurfaceReferenceFactory

cc/surfaces/surface_reference_factory.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 CC_SURFACES_SURFACE_REFERENCE_FACTORY_H_
+#define CC_SURFACES_SURFACE_REFERENCE_FACTORY_H_
+
+#include "base/memory/ref_counted.h"
+#include "cc/surfaces/surface_id.h"
+#include "cc/surfaces/surface_reference_owner.h"
+
+namespace cc {
+
+class SurfaceReferenceBase;
+class CompositorFrameMetadata;
+
+// Creates surface references. Returns an object of type
+// SurfaceReferenceBase which holds on to its corresponding
+// surface reference until destruction. The referenced surface
+// will be kept alive as long as there is a reference to it.
+class SurfaceReferenceFactory
+    : public base::RefCountedThreadSafe<SurfaceReferenceFactory> {
+ public:
+  virtual std::unique_ptr<SurfaceReferenceBase> CreateReference(
+      SurfaceReferenceOwner* owner,
+      const SurfaceId& surface_id) const = 0;
+
+  SurfaceReferenceFactory() = default;
+
+ protected:
+  virtual ~SurfaceReferenceFactory() = default;
+
+ private:
+  friend class SurfaceReferenceBase;
+  friend class base::RefCountedThreadSafe<SurfaceReferenceFactory>;
+
+  virtual void DestroyReference(SurfaceReferenceBase* surface_ref) const = 0;
+  virtual void DestroyReference(SurfaceReferenceBase* surface_ref,
+                                CompositorFrameMetadata* metadata) const = 0;
+
+  DISALLOW_COPY_AND_ASSIGN(SurfaceReferenceFactory);
+};
+
+}  // namespace cc
+
+#endif  // CC_SURFACES_SURFACE_REFERENCE_FACTORY_H_