cc/blimp: Set up the framework for state serialization.

cc/blimp/layer_factory.h

Index: cc/blimp/layer_factory.h
diff --git a/cc/blimp/layer_factory.h b/cc/blimp/layer_factory.h
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+++ b/cc/blimp/layer_factory.h
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+// 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_BLIMP_LAYER_FACTORY_H_
+#define CC_BLIMP_LAYER_FACTORY_H_
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+
+namespace cc {
+class Layer;
+
+// Used to allow tests to inject the Layer created by the
+// CompositorStateDeserializer on the client.
+class LayerFactory {
+ public:
+  virtual ~LayerFactory() {}
+
+  virtual scoped_refptr<Layer> CreateLayer(int engine_layer_id) = 0;
+};
+
+}  // namespace cc
+
+#endif  // CC_BLIMP_LAYER_FACTORY_H_