Increase HPACK table size up to the optimal size if clients allow it.

net/spdy/spdy_flags.cc

Index: net/spdy/spdy_flags.cc
diff --git a/net/spdy/spdy_flags.cc b/net/spdy/spdy_flags.cc
index ad4a2b1fc08ed0fc3e3f337677d64b0d85e7f3f3..3c6fd73dc8f5b65b158414af767450005d3796bd 100644
--- a/net/spdy/spdy_flags.cc
+++ b/net/spdy/spdy_flags.cc
@@ -13,6 +13,10 @@ bool FLAGS_chromium_http2_flag_spdy_framer_use_new_methods4 = true;
 // Use SpdyHeaderBlock::AppendValueOrAddHeader when adding to headers.
 bool FLAGS_chromium_http2_flag_use_new_spdy_header_block_header_joining = true;
 
+// If true, increase HPACK table size up to optimal size kOptTableSize if
+// clients allow it.
+bool FLAGS_chromium_reloadable_flag_increase_hpack_table_size = false;
+
 // Use NestedSpdyFramerDecoder.
 bool FLAGS_use_nested_spdy_framer_decoder = false;