Add net::SourceStream and net::FilterSourceStream

net/net.gypi

Index: net/net.gypi
diff --git a/net/net.gypi b/net/net.gypi
index 7246a059ccbd4e33ffbb59bb437db9be69d5cd8a..767e2f54c072dfb7abdae6f7a920a770778ebaaa 100644
--- a/net/net.gypi
+++ b/net/net.gypi
@@ -625,12 +625,17 @@
       'dns/serial_worker.h',
       'filter/filter.cc',
       'filter/filter.h',
+      'filter/filter_source_stream.cc',
+      'filter/filter_source_stream.h',
       'filter/gzip_filter.cc',
       'filter/gzip_filter.h',
       'filter/gzip_header.cc',
       'filter/gzip_header.h',
       'filter/sdch_filter.cc',
       'filter/sdch_filter.h',
+      'filter/source_stream.cc',
+      'filter/source_stream.h',
+      'filter/source_stream_type_list.h',
       'http/bidirectional_stream.cc',
       'http/bidirectional_stream.h',
       'http/bidirectional_stream_impl.cc',
@@ -1486,10 +1491,13 @@
       'extras/sqlite/sqlite_channel_id_store_unittest.cc',
       'extras/sqlite/sqlite_persistent_cookie_store_unittest.cc',
       'filter/brotli_filter_unittest.cc',
+      'filter/filter_source_stream_unittest.cc',
       'filter/filter_unittest.cc',
       'filter/gzip_filter_unittest.cc',
       'filter/mock_filter_context.cc',
       'filter/mock_filter_context.h',
+      'filter/mock_source_stream.cc',
+      'filter/mock_source_stream.h',
       'filter/sdch_filter_unittest.cc',
       'ftp/ftp_auth_cache_unittest.cc',
       'ftp/ftp_ctrl_response_buffer_unittest.cc',