Add a simple compositor for Sky

sky/compositor/surface_allocator.h

Index: sky/compositor/surface_allocator.h
diff --git a/sky/compositor/surface_allocator.h b/sky/compositor/surface_allocator.h
new file mode 100644
index 0000000000000000000000000000000000000000..98feb1118a6924bf841a71ddbb6a7911fea716ff
--- /dev/null
+++ b/sky/compositor/surface_allocator.h
@@ -0,0 +1,28 @@
+// Copyright 2014 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 SKY_COMPOSITOR_SURFACE_ALLOCATOR_H_
+#define SKY_COMPOSITOR_SURFACE_ALLOCATOR_H_
+
+#include "base/basictypes.h"
+
+namespace sky {
+
+class SurfaceAllocator {
+ public:
+  SurfaceAllocator(uint32_t id_namespace);
+  ~SurfaceAllocator();
+
+  uint64_t CreateSurfaceId();
+
+ private:
+  uint32_t id_namespace_;
+  uint32_t next_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(SurfaceAllocator);
+};
+
+}  // namespace sky
+
+#endif  // SKY_COMPOSITOR_SURFACE_ALLOCATOR_H_