Not for review.

cc/output/overlay_renderer.h

Index: cc/output/overlay_renderer.h
diff --git a/cc/output/overlay_renderer.h b/cc/output/overlay_renderer.h
new file mode 100644
index 0000000000000000000000000000000000000000..45fd3c2380502a3a553f2c405a579204f95cdab7
--- /dev/null
+++ b/cc/output/overlay_renderer.h
@@ -0,0 +1,36 @@
+// Copyright 2012 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_OUTPUT_OVERLAY_RENDERER_H_
+#define CC_OUTPUT_OVERLAY_RENDERER_H_
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "cc/base/cc_export.h"
+#include "cc/quads/render_pass.h"
+
+namespace cc {
+
+class CC_EXPORT OverlayRenderer {
+ public:
+  class Strategy {
+   public:
+    virtual ~Strategy() {}
+    virtual bool Attempt(RenderPassList* render_passes_in_draw_order) = 0;
+  };
+  virtual ~OverlayRenderer();
+  OverlayRenderer();
+
+  void Initialize();
+  void ProcessForOverlays(RenderPassList* render_passes_in_draw_order);
+
+ private:
+  typedef ScopedPtrVector<Strategy> StrategyList;
+  StrategyList strategies_;
+  DISALLOW_COPY_AND_ASSIGN(OverlayRenderer);
+};
+
+}  // namespace cc
+
+#endif  // CC_OUTPUT_OVERLAY_RENDERER_H_