Revert of Splitting of layers for correct intersections

cc/quads/draw_polygon.h

Index: cc/quads/draw_polygon.h
diff --git a/cc/quads/draw_polygon.h b/cc/quads/draw_polygon.h
index 0ca95451d28f7a9114171b5d4f73834aa7335020..32643eed23c78ebf264ca21e0ce934c2c6a772a9 100644
--- a/cc/quads/draw_polygon.h
+++ b/cc/quads/draw_polygon.h
@@ -24,11 +24,11 @@
   DrawPolygon();
   ~DrawPolygon();
 
-  DrawPolygon(const DrawQuad* original_ref,
+  DrawPolygon(DrawQuad* original_ref,
               const std::vector<gfx::Point3F>& in_points,
               const gfx::Vector3dF& normal,
               int draw_order_index = 0);
-  DrawPolygon(const DrawQuad* original_ref,
+  DrawPolygon(DrawQuad* original_ref,
               const gfx::RectF& visible_content_rect,
               const gfx::Transform& transform,
               int draw_order_index = 0);
@@ -56,7 +56,7 @@
   const gfx::Vector3dF& normal() const { return normal_; }
   const DrawQuad* original_ref() const { return original_ref_; }
   int order_index() const { return order_index_; }
-  bool is_split() const { return is_split_; }
+
   scoped_ptr<DrawPolygon> CreateCopy();
 
   static gfx::Vector3dF default_normal;
@@ -76,8 +76,7 @@
   // we need.
   // This DrawQuad is owned by the caller and its lifetime must be preserved
   // as long as this DrawPolygon is alive.
-  const DrawQuad* original_ref_;
-  bool is_split_;
+  DrawQuad* original_ref_;
 };
 
 }  // namespace cc