[SafeBrowsing] Consolidate extension lookup logic and extension lists.

chrome/common/safe_browsing/download_protection_util.h

 // Copyright (c) 2012 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_COMMON_SAFE_BROWSING_DOWNLOAD_PROTECTION_UTIL_H_
 #define CHROME_COMMON_SAFE_BROWSING_DOWNLOAD_PROTECTION_UTIL_H_
 
 #include "chrome/common/safe_browsing/csd.pb.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace safe_browsing {
 namespace download_protection_util {
 
 // Returns true if the given file is a supported binary file type.
 bool IsSupportedBinaryFile(const base::FilePath& file);
 
 // Returns true if the given file is a supported archive file type.
 bool IsArchiveFile(const base::FilePath& file);
 
 // Returns the DownloadType of the file at |path|. This function is only valid
 // for paths that satisfy IsSupportedBinaryFile() above.
 ClientDownloadRequest::DownloadType GetDownloadType(const base::FilePath& file);
 
+// The maximum value returned by GetSBClientDownloadExtensionValueForUMA() + 1.
+extern const int kSBClientDownloadExtensionsMax;
+
+// SBClientDownloadExtensions UMA enum value corresponding to |file|.
+int GetSBClientDownloadExtensionValueForUMA(const base::FilePath& file);
+
 }  // namespace download_protection_util
 }  // namespace safe_browsing
 
 #endif  // CHROME_COMMON_SAFE_BROWSING_DOWNLOAD_PROTECTION_UTIL_H_