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

webkit/media/test_response_generator.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_TEST_RESPONSE_GENERATOR_H_
 #define WEBKIT_MEDIA_TEST_RESPONSE_GENERATOR_H_
 
 #include "base/basictypes.h"
 #include "googleurl/src/gurl.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebURLError.h"
@@ skipping 27 matching lines @@
   WebKit::WebURLResponse Generate206(int64 first_byte_offset);
 
   // Generates a custom HTTP 206 response starting from |first_byte_offset|
   // until the end of the resource. You can tweak what gets included in the
   // headers via |flags|.
   WebKit::WebURLResponse Generate206(int64 first_byte_offset, Flags flags);
 
   // Generates a regular HTTP 404 response.
   WebKit::WebURLResponse Generate404();
 
+  // Generates a file:// response starting from |first_byte_offset| until the
+  // end of the resource.
+  //
+  // If |first_byte_offset| is negative a response containing no content length
+  // will be returned.
+  WebKit::WebURLResponse GenerateFileResponse(int64 first_byte_offset);
+
   const GURL& gurl() { return gurl_; }
   int64 content_length() { return content_length_; }
 
  private:
   GURL gurl_;
   int64 content_length_;
 
   DISALLOW_COPY_AND_ASSIGN(TestResponseGenerator);
 };
 
 }  // namespace webkit_media
 
 #endif  // WEBKIT_MEDIA_TEST_RESPONSE_GENERATOR_H_