Add code count for gfe2_reloadable_flag_http2_use_fast_huffman_encoder.

Protected by gfe2_reloadable_flag_http2_use_fast_huffman_encoder.

PiperOrigin-RevId: 339042596
Change-Id: I86c9f0842649140c31ba16622df9d53a1dd48751

spdy/core/hpack/hpack_encoder.cc

diff --git a/spdy/core/hpack/hpack_encoder.cc b/spdy/core/hpack/hpack_encoder.cc
index 6ad6a5f..c0d2ec6 100644
--- a/spdy/core/hpack/hpack_encoder.cc
+++ b/spdy/core/hpack/hpack_encoder.cc
@@ -210,6 +210,7 @@
     output_stream_.AppendPrefix(kStringLiteralHuffmanEncoded);
     output_stream_.AppendUint32(encoded_size);
     if (use_fast_huffman_encoder_) {
+      SPDY_CODE_COUNT(http2_use_fast_huffman_encoder);
       http2::HuffmanEncodeFast(str, encoded_size,
                                output_stream_.MutableString());
     } else {