Fire CanPlayThrough immediately for local and streaming media files

media/filters/file_data_source.cc

 // 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.
 
 #include <limits>
 
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
 #include "media/base/filter_host.h"
@@ skipping 100 matching lines @@
 bool FileDataSource::IsStreaming() {
   return false;
 }
 
 void FileDataSource::SetPreload(Preload preload) {
 }
 
 void FileDataSource::SetBitrate(int bitrate) {
 }
 
+bool FileDataSource::IsLocalSource() {
+  return true;
+}
+
 }  // namespace media