Implement "streaming" $i18n{} replacer

net/filter/filter.h

 // Copyright 2014 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.
 //
 // Filter performs filtering on data streams. Sample usage:
 //
 //   IStream* pre_filter_source;
 //   ...
 //   std::unique_ptr<Filter> filter = Filter::Factory(filter_type, size);
 //   int pre_filter_data_len = filter->stream_buffer_size();
@@ skipping 221 matching lines @@
   // response was made to an SDCH request (i.e., an available dictionary was
   // advertised in the GET), as well as the mime type of the content.
   static void FixupEncodingTypes(const FilterContext& filter_context,
                                  std::vector<FilterType>* encoding_types);
 
   // Returns a string describing the FilterTypes implemented by this filter.
   std::string OrderedFilterList() const;
 
   FilterType type() const { return type_id_; }
 
+  // Sets |next_filter| as the next filter to be run, disconnecting any existing
+  // chain.
+  void TakeNextFilter(std::unique_ptr<Filter> next_filter);
+
  protected:
   friend class BrotliUnitTest;
   friend class GZipUnitTest;
   friend class SdchFilterChainingTest;
   FRIEND_TEST_ALL_PREFIXES(FilterTest, ThreeFilterChain);
 
   explicit Filter(FilterType type_id);
 
   // Filters the data stored in stream_buffer_ and writes the output into the
   // dest_buffer passed in.
@@ skipping 70 matching lines @@
 
   // The filter type this filter was constructed from.
   FilterType type_id_;
 
   DISALLOW_COPY_AND_ASSIGN(Filter);
 };
 
 }  // namespace net
 
 #endif  // NET_FILTER_FILTER_H__