cc: Refactor TileTaskWorkerPool.

cc/raster/gpu_tile_task_worker_pool.h

-// 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 CC_RASTER_GPU_TILE_TASK_WORKER_POOL_H_
-#define CC_RASTER_GPU_TILE_TASK_WORKER_POOL_H_
-
-#include <stdint.h>
-
-#include "base/macros.h"
-#include "cc/raster/tile_task_worker_pool.h"
-
-namespace cc {
-class ContextProvider;
-class GpuRasterizer;
-class ResourceProvider;
-
-class CC_EXPORT GpuTileTaskWorkerPool : public TileTaskWorkerPool,
-                                        public RasterBufferProvider {
- public:
-  ~GpuTileTaskWorkerPool() override;
-
-  static std::unique_ptr<TileTaskWorkerPool> Create(
-      base::SequencedTaskRunner* task_runner,
-      TaskGraphRunner* task_graph_runner,
-      ContextProvider* context_provider,
-      ResourceProvider* resource_provider,
-      bool use_distance_field_text,
-      int gpu_rasterization_msaa_sample_count);
-
-  // Overridden from TileTaskWorkerPool:
-  void Shutdown() override;
-  void ScheduleTasks(TaskGraph* graph) override;
-  void CheckForCompletedTasks() override;
-  ResourceFormat GetResourceFormat(bool must_support_alpha) const override;
-  bool GetResourceRequiresSwizzle(bool must_support_alpha) const override;
-  RasterBufferProvider* AsRasterBufferProvider() override;
-
-  // Overridden from RasterBufferProvider:
-  std::unique_ptr<RasterBuffer> AcquireBufferForRaster(
-      const Resource* resource,
-      uint64_t resource_content_id,
-      uint64_t previous_content_id) override;
-  void ReleaseBufferForRaster(std::unique_ptr<RasterBuffer> buffer) override;
-
- private:
-  GpuTileTaskWorkerPool(base::SequencedTaskRunner* task_runner,
-                        TaskGraphRunner* task_graph_runner,
-                        ContextProvider* context_provider,
-                        ResourceProvider* resource_provider,
-                        bool use_distance_field_text,
-                        int gpu_rasterization_msaa_sample_count);
-
-  void CompleteTasks(const Task::Vector& tasks);
-
-  scoped_refptr<base::SequencedTaskRunner> task_runner_;
-  TaskGraphRunner* task_graph_runner_;
-  const NamespaceToken namespace_token_;
-  std::unique_ptr<GpuRasterizer> rasterizer_;
-
-  Task::Vector completed_tasks_;
-
-  DISALLOW_COPY_AND_ASSIGN(GpuTileTaskWorkerPool);
-};
-
-}  // namespace cc
-
-#endif  // CC_RASTER_GPU_TILE_TASK_WORKER_POOL_H_