Add the ability to clear the shader disk cache.

content/browser/gpu/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 CONTENT_BROWSER_GPU_SHADER_DISK_CACHE_H_
-#define CONTENT_BROWSER_GPU_SHADER_DISK_CACHE_H_
-
-#include <map>
-#include <string>
-
-#include "base/files/file_path.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/singleton.h"
-#include "net/disk_cache/disk_cache.h"
-
-namespace content {
-
-class ShaderDiskCacheEntry;
-class ShaderDiskReadHelper;
-
-// ShaderDiskCache is the interface to the on disk cache for
-// GL shaders.
-//
-// While this class is both RefCounted and SupportsWeakPtr
-// when using this class you should work with the RefCounting.
-// The WeakPtr is needed interally.
-class ShaderDiskCache
-    : public base::RefCounted<ShaderDiskCache>,
-      public base::SupportsWeakPtr<ShaderDiskCache> {
- public:
-  void Init();
-
-  void set_host_id(int host_id) { host_id_ = host_id; }
-  void set_max_cache_size(size_t max_cache_size) {
-    max_cache_size_ = max_cache_size;
-  }
-
-  void Cache(const std::string& key, const std::string& shader);
-
- private:
-  friend class base::RefCounted<ShaderDiskCache>;
-  friend class ShaderDiskCacheEntry;
-  friend class ShaderDiskReadHelper;
-  friend class ShaderCacheFactory;
-
-  explicit ShaderDiskCache(const base::FilePath& cache_path);
-  ~ShaderDiskCache();
-
-  void CacheCreatedCallback(int rv);
-
-  disk_cache::Backend* backend() { return backend_; }
-
-  void EntryComplete(void* entry);
-  void ReadComplete();
-
-  bool cache_available_;
-  size_t max_cache_size_;
-  int host_id_;
-  base::FilePath cache_path_;
-  bool is_initialized_;
-
-  disk_cache::Backend* backend_;
-
-  scoped_refptr<ShaderDiskReadHelper> helper_;
-  std::map<void*, scoped_refptr<ShaderDiskCacheEntry> > entry_map_;
-
-  DISALLOW_COPY_AND_ASSIGN(ShaderDiskCache);
-};
-
-// ShaderCacheFactory maintains a cache of ShaderDiskCache objects
-// so we only create one per profile directory.
-class ShaderCacheFactory {
- public:
-  static ShaderCacheFactory* GetInstance();
-
-  scoped_refptr<ShaderDiskCache> Get(int32 client_id);
-
-  void SetCacheInfo(int32 client_id, const base::FilePath& path);
-  void RemoveCacheInfo(int32 client_id);
-
-  void AddToCache(const base::FilePath& path, ShaderDiskCache* cache);
-  void RemoveFromCache(const base::FilePath& path);
-
- private:
-  friend struct DefaultSingletonTraits<ShaderCacheFactory>;
-
-  ShaderCacheFactory();
-  ~ShaderCacheFactory();
-
-  typedef std::map<base::FilePath, ShaderDiskCache*> ShaderCacheMap;
-  ShaderCacheMap shader_cache_map_;
-
-  typedef std::map<int32, base::FilePath> ClientIdToPathMap;
-  ClientIdToPathMap client_id_to_path_map_;
-
-  DISALLOW_COPY_AND_ASSIGN(ShaderCacheFactory);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_GPU_SHADER_DISK_CACHE_H_
-