Have media gallery (through native media file util) use MIME sniffer

net/base/mime_sniffer.h

 // Copyright (c) 2011 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_SNIFFER_H__
 #define NET_BASE_MIME_SNIFFER_H__
 
 #include <string>
 
 #include "net/base/net_export.h"
 
 class GURL;
 
 namespace net {
 
 // The maximum number of bytes used by any internal mime sniffing routine. May
 // be useful for callers to determine an efficient buffer size to pass to
 // |SniffMimeType|.
 // This must be updated if any internal sniffing routine needs more bytes.
 const int kMaxBytesToSniff = 1024;
 
+NET_EXPORT bool IdentifyExtraMimeType(const char* content,

[vandebo (ex-Chrome), 2013/04/29 19:43:50]

nit: add a comment and move below SniffMimeType

[Kevin Bailey, 2013/04/30 20:57:56]

Done.

+                                      size_t content_size,
+                                      std::string* result);
+
 // Examine the URL and the mime_type and decide whether we should sniff a
 // replacement mime type from the content.
 //
 // @param url The URL from which we obtained the content.
 // @param mime_type The current mime type, e.g. from the Content-Type header.
 // @return Returns true if we should sniff the mime type.
 NET_EXPORT bool ShouldSniffMimeType(const GURL& url,
                                     const std::string& mime_type);
 
 // Guess a mime type from the first few bytes of content an its URL.  Always
 // assigns |result| with its best guess of a mime type.
 //
 // @param content A buffer containing the bytes to sniff.
 // @param content_size The number of bytes in the |content| buffer.
 // @param url The URL from which we obtained this content.
 // @param type_hint The current mime type, e.g. from the Content-Type header.
 // @param result Address at which to place the sniffed mime type.
 // @return Returns true if we have enough content to guess the mime type.
 NET_EXPORT bool SniffMimeType(const char* content, size_t content_size,
                               const GURL& url, const std::string& type_hint,
                               std::string* result);
 
 }  // namespace net
 
 #endif  // NET_BASE_MIME_SNIFFER_H__