Write file:// tests for BufferedDataSource and fix some bugs as a result.

webkit/media/buffered_data_source.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 WEBKIT_MEDIA_BUFFERED_DATA_SOURCE_H_
 #define WEBKIT_MEDIA_BUFFERED_DATA_SOURCE_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 136 matching lines @@
       BufferedResourceLoader::LoadingState state);
   void HttpProgressCallback(int64 position);
 
   void UpdateHostState_Locked();
 
   // URL of the resource requested.
   GURL url_;
   // crossorigin attribute on the corresponding HTML media element, if any.
   BufferedResourceLoader::CORSMode cors_mode_;
 
-  // Members for total bytes of the requested object. It is written once on
-  // render thread but may be read from any thread. However reading of this
-  // member is guaranteed to happen after it is first written, so we don't
-  // need to protect it.
+  // The total size of the resource. Set during StartCallback() if the size is
+  // known, otherwise it will remain kPositionNotSpecified until the size is
+  // determined by reaching EOF.
   int64 total_bytes_;
-  int64 buffered_bytes_;
+
+  // Some resources are assumed to be fully buffered (i.e., file://) so we don't
+  // need to report what |loader_| has buffered.
+  bool assume_fully_buffered_;
 
   // This value will be true if this data source can only support streaming.
   // i.e. range request is not supported.
   bool streaming_;
 
   // A webframe for loading.
   WebKit::WebFrame* frame_;
 
   // A resource loader for the media resource.
   scoped_ptr<BufferedResourceLoader> loader_;
@@ skipping 56 matching lines @@
   scoped_refptr<media::MediaLog> media_log_;
 
   DownloadingCB downloading_cb_;
 
   DISALLOW_COPY_AND_ASSIGN(BufferedDataSource);
 };
 
 }  // namespace webkit_media
 
 #endif  // WEBKIT_MEDIA_BUFFERED_DATA_SOURCE_H_