Validate hash_sha256 checksum on .crx update.

extensions/browser/crx_file_info.h

+// Copyright (c) 2015 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 EXTENSIONS_BROWSER_CRX_FILE_INFO_H_
+#define EXTENSIONS_BROWSER_CRX_FILE_INFO_H_
+
+#include <string>
+
+#include "base/files/file_path.h"
+
+namespace extensions {
+
+// CRXFileInfo holds general information about a cached CRX file
+struct CRXFileInfo {
+  CRXFileInfo();
+  CRXFileInfo(const std::string& extension_id,
+              const base::FilePath& path,
+              const std::string& hash);
+  CRXFileInfo(const std::string& extension_id, const base::FilePath& path);
+  explicit CRXFileInfo(const base::FilePath& path);
+
+  bool operator==(const CRXFileInfo& that) const;
+
+  // The only mandatory field is the file path, whereas extension_id and hash
+  // are only being checked if those are non-empty.
+  std::string extension_id;
+  base::FilePath path;
+  std::string expected_hash;
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_CRX_FILE_H_