WIP BSP Tree for 3D Layer Sorting

cc/output/bsp_walk_action.h

Index: cc/output/bsp_walk_action.h
diff --git a/cc/output/bsp_walk_action.h b/cc/output/bsp_walk_action.h
new file mode 100644
index 0000000000000000000000000000000000000000..073db1ddf9b3299d5c59a23f4a080d3994cbc299
--- /dev/null
+++ b/cc/output/bsp_walk_action.h
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+// Copyright 2013 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_BSP_WALK_ACTION_H_
+#define CC_OUTPUT_BSP_WALK_ACTION_H_
+
+#include <vector>
+
+#include "base/memory/scoped_ptr.h"
+#include "cc/output/direct_renderer.h"
+#include "cc/quads/draw_polygon.h"
+
+namespace cc {
+
+template <typename T>
+class BspWalkAction {
+ public:
+  virtual void operator()(T* item) = 0;
+};
+
+// Currently commented out because DoDrawPolygon is not a part of
+// DirectRenderer yet. That will come in a later patch.
+/* class BspWalkActionDrawPolygon : public BspWalkAction<DrawPolygon> {
+ public:
+  virtual void operator()(DrawPolygon& item) OVERRIDE {
+    // Here's where we do work!
+    gfx::Transform inverse_transform;
+    item.GetInverseTransform(&inverse_transform);
+    item.ApplyTransform(inverse_transform);
+    renderer_.DoDrawPolygon(item, frame_);
+  }
+
+  BspWalkActionDrawPolygon(DirectRenderer& renderer,
+                           DirectRenderer::DrawingFrame* frame)
+      : renderer_(renderer), frame_(frame) {}
+
+ private:
+  DirectRenderer& renderer_;
+  DirectRenderer::DrawingFrame* frame_;
+}; */
+
+class BspWalkActionToVector : public BspWalkAction<DrawPolygon> {
+ public:
+  explicit BspWalkActionToVector(std::vector<DrawPolygon*>* in_list);
+  virtual void operator()(DrawPolygon* item)OVERRIDE;
+
+ private:
+  std::vector<DrawPolygon*>* list_;
+};
+
+}  // namespace cc
+
+#endif  // CC_OUTPUT_BSP_WALK_ACTION_H_