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

webkit/fileapi/media/native_media_file_util.h

Index: webkit/fileapi/media/native_media_file_util.h
diff --git a/webkit/fileapi/media/native_media_file_util.h b/webkit/fileapi/media/native_media_file_util.h
index b1e35733d850b983781dc2434079e6aab9ed48c8..926241286d932bcfc85d0abc5e1fadfd29c9c01e 100644
--- a/webkit/fileapi/media/native_media_file_util.h
+++ b/webkit/fileapi/media/native_media_file_util.h
@@ -58,6 +58,12 @@ class WEBKIT_STORAGE_EXPORT_PRIVATE NativeMediaFileUtil
       const FileSystemURL& url,
       base::PlatformFileInfo* file_info,
       base::FilePath* platform_path) OVERRIDE;
+  virtual base::PlatformFileError CreateSnapshotFile(
+      FileSystemOperationContext* context,
+      const FileSystemURL& url,
+      base::PlatformFileInfo* file_info,
+      base::FilePath* platform_path,
+      SnapshotFilePolicy* snapshot_policy) OVERRIDE;
 
  private:
   // Like GetLocalFilePath(), but always take media_path_filter() into
@@ -80,6 +86,11 @@ class WEBKIT_STORAGE_EXPORT_PRIVATE NativeMediaFileUtil
       base::PlatformFileError failure_error,
       base::FilePath* local_file_path);
 
+  // Uses the MIME sniffer code, which actually looks into the file,
+  // to determine if it is really a media file (versus a potential
+  // Trojan horse.)
+  bool IsMediaFile(const base::FilePath& path);
+
   DISALLOW_COPY_AND_ASSIGN(NativeMediaFileUtil);
 };