text: // 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 FLUTTER_CONTENT_HANDLER_RASTERIZER_H_
  #define FLUTTER_CONTENT_HANDLER_RASTERIZER_H_
  
  #include <memory>
  
  #include "flutter/flow/layers/layer_tree.h"
  #include "lib/fxl/functional/closure.h"
  #include "lib/fxl/macros.h"
  #include "lib/ui/scenic/fidl/session.fidl.h"
  #include "zircon/system/ulib/zx/include/zx/eventpair.h"
  
  namespace flutter_runner {
  
  class Rasterizer {
   public:
    virtual ~Rasterizer();
  
    static std::unique_ptr<Rasterizer> Create();
  
    virtual void SetScene(
        fidl::InterfaceHandle<scenic::SceneManager> scene_manager,
        zx::eventpair import_token,
        fxl::Closure metrics_changed_callback) = 0;
  
    virtual void Draw(std::unique_ptr<flow::LayerTree> layer_tree,
                      fxl::Closure callback) = 0;
  };
  
  }  // namespace flutter_runner
  
  #endif  // FLUTTER_CONTENT_HANDLER_RASTERIZER_H_
  