Implement Drain() on HttpPipelinedStream.

net/http/http_response_headers.h

 // 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.
 
 #ifndef NET_HTTP_HTTP_RESPONSE_HEADERS_H_
 #define NET_HTTP_HTTP_RESPONSE_HEADERS_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 221 matching lines @@
   // valid for a 206 response; otherwise returns false.
   // The following values will be outputted:
   // |*first_byte_position| = inclusive position of the first byte of the range
   // |*last_byte_position| = inclusive position of the last byte of the range
   // |*instance_length| = size in bytes of the object requested
   // If any of the above values is unknown, its value will be -1.
   bool GetContentRange(int64* first_byte_position,
                        int64* last_byte_position,
                        int64* instance_length) const;
 
+  // Returns true if the response is chunk-encoded.
+  bool IsChunkEncoded() const;
+
   // Returns the HTTP response code.  This is 0 if the response code text seems
   // to exist but could not be parsed.  Otherwise, it defaults to 200 if the
   // response code is not found in the raw headers.
   int response_code() const { return response_code_; }
 
   // Returns the raw header string.
   const std::string& raw_headers() const { return raw_headers_; }
 
  private:
   friend class base::RefCountedThreadSafe<HttpResponseHeaders>;
@@ skipping 100 matching lines @@
 
   // The parsed http version number (not normalized).
   HttpVersion parsed_http_version_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpResponseHeaders);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_RESPONSE_HEADERS_H_