Implement ChromeOS mime type extension mappings.

net/base/mime_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 NET_BASE_MIME_UTIL_H__
 #define NET_BASE_MIME_UTIL_H__
 
 // This file defines MIME utility functions. All of them assume the MIME type
 // to be of the format specified by rfc2045. According to it, MIME types are
 // case strongly insensitive except parameter values, which may or may not be
@@ skipping 148 matching lines @@
                                            const std::string& value,
                                            const std::string& mime_boundary,
                                            const std::string& content_type,
                                            std::string* post_data);
 
 // Adds the final delimiter to a multi-part upload request.
 NET_EXPORT void AddMultipartFinalDelimiterForUpload(
     const std::string& mime_boundary,
     std::string* post_data);
 
+struct MimeInfo {
+  const char* const mime_type;
+  const char* const extensions;  // comma separated list
+};
+
+// Finds mime type of |ext| from |mappings|.
+const char* FindMimeType(const MimeInfo* mappings,
+                         size_t mappings_len,
+                         const char* ext);
+
 }  // namespace net
 
 #endif  // NET_BASE_MIME_UTIL_H__