Revert of gpu: Move ShaderDiskCache into //gpu/ipc/host component.

gpu/ipc/host/shader_disk_cache.h

-// Copyright (c) 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 GPU_IPC_HOST_SHADER_DISK_CACHE_H_
-#define GPU_IPC_HOST_SHADER_DISK_CACHE_H_
-
-#include <stdint.h>
-
-#include <map>
-#include <queue>
-#include <string>
-
-#include "base/files/file_path.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/threading/thread_checker.h"
-#include "net/disk_cache/disk_cache.h"
-
-namespace gpu {
-
-class ShaderDiskCacheEntry;
-class ShaderDiskReadHelper;
-class ShaderClearHelper;
-
-// ShaderDiskCache is the interface to the on disk cache for
-// GL shaders.
-class ShaderDiskCache : public base::RefCounted<ShaderDiskCache> {
- public:
-  using ShaderLoadedCallback =
-      base::Callback<void(const std::string&, const std::string&)>;
-
-  void set_shader_loaded_callback(const ShaderLoadedCallback& callback) {
-    shader_loaded_callback_ = callback;
-  }
-
-  // Store the |shader| into the cache under |key|.
-  void Cache(const std::string& key, const std::string& shader);
-
-  // Clear a range of entries. This supports unbounded deletes in either
-  // direction by using null Time values for either |begin_time| or |end_time|.
-  // The return value is a net error code. If this method returns
-  // ERR_IO_PENDING, the |completion_callback| will be invoked when the
-  // operation completes.
-  int Clear(const base::Time begin_time,
-            const base::Time end_time,
-            const net::CompletionCallback& completion_callback);
-
-  // Sets a callback for when the cache is available. If the cache is
-  // already available the callback will not be called and net::OK is returned.
-  // If the callback is set net::ERR_IO_PENDING is returned and the callback
-  // will be executed when the cache is available.
-  int SetAvailableCallback(const net::CompletionCallback& callback);
-
-  // Returns the number of elements currently in the cache.
-  int32_t Size();
-
-  // Set a callback notification for when all current entries have been
-  // written to the cache.
-  // The return value is a net error code. If this method returns
-  // ERR_IO_PENDING, the |callback| will be invoked when all entries have
-  // been written to the cache.
-  int SetCacheCompleteCallback(const net::CompletionCallback& callback);
-
- private:
-  friend class base::RefCounted<ShaderDiskCache>;
-  friend class ShaderDiskCacheEntry;
-  friend class ShaderDiskReadHelper;
-  friend class ShaderCacheFactory;
-
-  explicit ShaderDiskCache(const base::FilePath& cache_path);
-  ~ShaderDiskCache();
-
-  void Init(scoped_refptr<base::SingleThreadTaskRunner> cache_task_runner);
-  void CacheCreatedCallback(int rv);
-
-  disk_cache::Backend* backend() { return backend_.get(); }
-
-  void EntryComplete(ShaderDiskCacheEntry* entry);
-  void ReadComplete();
-
-  bool cache_available_;
-  base::FilePath cache_path_;
-  bool is_initialized_;
-  net::CompletionCallback available_callback_;
-  net::CompletionCallback cache_complete_callback_;
-  ShaderLoadedCallback shader_loaded_callback_;
-
-  std::unique_ptr<disk_cache::Backend> backend_;
-
-  std::unique_ptr<ShaderDiskReadHelper> helper_;
-  std::unordered_map<ShaderDiskCacheEntry*,
-                     std::unique_ptr<ShaderDiskCacheEntry>>
-      entries_;
-
-  DISALLOW_COPY_AND_ASSIGN(ShaderDiskCache);
-};
-
-// ShaderCacheFactory maintains a cache of ShaderDiskCache objects
-// so we only create one per profile directory.
-class ShaderCacheFactory : public base::ThreadChecker {
- public:
-  // Initializes the ShaderCacheFactory singleton instance. The singleton
-  // instance is created and used in the thread associated with |task_runner|.
-  // |cache_task_runner| is associated with the thread responsible for managing
-  // the disk cache.
-  static void InitInstance(
-      scoped_refptr<base::SingleThreadTaskRunner> task_runner,
-      scoped_refptr<base::SingleThreadTaskRunner> cache_task_runner);
-
-  // Returns an instance previously created by InitInstance(). This can return
-  // nullptr if an instance has not yet been created.
-  static ShaderCacheFactory* GetInstance();
-
-  // Clear the shader disk cache for the given |path|. This supports unbounded
-  // deletes in either direction by using null Time values for either
-  // |begin_time| or |end_time|. The |callback| will be executed when the
-  // clear is complete.
-  void ClearByPath(const base::FilePath& path,
-                   const base::Time& begin_time,
-                   const base::Time& end_time,
-                   const base::Closure& callback);
-
-  // Retrieve the shader disk cache for the provided |client_id|.
-  scoped_refptr<ShaderDiskCache> Get(int32_t client_id);
-
-  // Set the |path| to be used for the disk cache for |client_id|.
-  void SetCacheInfo(int32_t client_id, const base::FilePath& path);
-
-  // Remove the path mapping for |client_id|.
-  void RemoveCacheInfo(int32_t client_id);
-
-  // Set the provided |cache| into the cache map for the given |path|.
-  void AddToCache(const base::FilePath& path, ShaderDiskCache* cache);
-
-  // Remove the provided |path| from our cache map.
-  void RemoveFromCache(const base::FilePath& path);
-
- private:
-  friend class ShaderClearHelper;
-
-  explicit ShaderCacheFactory(
-      scoped_refptr<base::SingleThreadTaskRunner> cache_task_runner);
-  ~ShaderCacheFactory();
-
-  static void CreateFactoryInstance(
-      scoped_refptr<base::SingleThreadTaskRunner> cache_task_runner);
-
-  scoped_refptr<base::SingleThreadTaskRunner> cache_task_runner_;
-
-  scoped_refptr<ShaderDiskCache> GetByPath(const base::FilePath& path);
-  void CacheCleared(const base::FilePath& path);
-
-  using ShaderCacheMap = std::map<base::FilePath, ShaderDiskCache*>;
-  ShaderCacheMap shader_cache_map_;
-
-  using ClientIdToPathMap = std::map<int32_t, base::FilePath>;
-  ClientIdToPathMap client_id_to_path_map_;
-
-  using ShaderClearQueue = std::queue<std::unique_ptr<ShaderClearHelper>>;
-  using ShaderClearMap = std::map<base::FilePath, ShaderClearQueue>;
-  ShaderClearMap shader_clear_map_;
-
-  DISALLOW_COPY_AND_ASSIGN(ShaderCacheFactory);
-};
-
-}  // namespace gpu
-
-#endif  // GPU_IPC_HOST_SHADER_DISK_CACHE_H_