Implement media path filter

webkit/fileapi/media/media_path_filter.cc

Index: webkit/fileapi/media/media_path_filter.cc
diff --git a/webkit/fileapi/media/media_path_filter.cc b/webkit/fileapi/media/media_path_filter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..111735dd719155682ab524d7724206483a17d54a
--- /dev/null
+++ b/webkit/fileapi/media/media_path_filter.cc
@@ -0,0 +1,27 @@
+// 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.
+
+#include "webkit/fileapi/media/media_path_filter.h"
+
+#include <algorithm>
+
+#include "base/string_util.h"
+#include "net/base/mime_util.h"
+
+namespace fileapi {
+
+MediaPathFilter::MediaPathFilter() {
+  net::GetImageExtensions(&media_file_extensions_);
+  net::GetAudioExtensions(&media_file_extensions_);
+  net::GetVideoExtensions(&media_file_extensions_);
+  std::sort(media_file_extensions_.begin(), media_file_extensions_.end());
+}
+
+bool MediaPathFilter::Match(const FilePath& path) const {
+  return std::binary_search(media_file_extensions_.begin(),
+                            media_file_extensions_.end(),
+                            StringToLowerASCII(path.Extension()));
+}
+
+}  // namespace fileapi