Move ExtensionCache to //extensions

chrome/browser/extensions/updater/extension_cache.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 CHROME_BROWSER_EXTENSIONS_UPDATER_EXTENSION_CACHE_H_
-#define CHROME_BROWSER_EXTENSIONS_UPDATER_EXTENSION_CACHE_H_
-
-#include <string>
-
-#include "base/callback_forward.h"
-#include "base/files/file_path.h"
-
-namespace extensions {
-
-// ExtensionCache interface that caches extensions .crx files to share them
-// between multiple users and profiles on the machine.
-class ExtensionCache {
- public:
-  // Return global singleton instance of ExtensionCache.
-  static ExtensionCache* GetInstance();
-
-  // Callback that is invoked when the file placed when PutExtension done.
-  typedef base::Callback<void(const base::FilePath& file_path,
-                              bool file_ownership_passed)> PutExtensionCallback;
-
-  // Initialize cache in background. The |callback| is called when cache ready.
-  // Can be called multiple times. The |callback| can be called immediately if
-  // cache is ready.
-  virtual void Start(const base::Closure& callback) = 0;
-
-  // Shut down the cache. Must be called at most once on browser shutdown.
-  virtual void Shutdown(const base::Closure& callback) = 0;
-
-  // Allow caching for the extension with given |id|. User specific extensions
-  // should not be cached for privacy reasons. But default apps including policy
-  // configured can be cached. Can be called before Init.
-  virtual void AllowCaching(const std::string& id) = 0;
-
-  // If extension with |id| exists in the cache, returns |true|, |file_path| and
-  // |version| for the extension. Extension will be marked as used with current
-  // timestamp.
-  virtual bool GetExtension(const std::string& id,
-                            base::FilePath* file_path,
-                            std::string* version) = 0;
-
-  // Put extension with |id| and |version| into local cache. Older version in
-  // the cache will removed be on next run so it can be safely used. Extension
-  // will be marked as used with current timestamp. The file will be available
-  // via GetExtension when |callback| is called. Original |file_path| won't be
-  // deleted from the disk. There is no guarantee that |callback| will be
-  // called.
-  virtual void PutExtension(const std::string& id,
-                            const base::FilePath& file_path,
-                            const std::string& version,
-                            const PutExtensionCallback& callback) = 0;
-
- protected:
-  virtual ~ExtensionCache() {}
-
-  // Sets the singleton to the given |cache|. Returns the previous value of
-  // the singleton. Ownership is not transferred.
-  static ExtensionCache* SetForTesting(ExtensionCache* cache);
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_BROWSER_EXTENSIONS_UPDATER_EXTENSION_CACHE_H_