Enforce limit on number of blocked streams in QPACK decoder.

gfe-relnote: n/a, change to QUIC v99-only code.  Protected by existing disabled gfe2_reloadable_flag_quic_enable_version_99.
PiperOrigin-RevId: 264688336
Change-Id: Iab1e97a9f31ef95d8dfa05ca8439bf066913b5ba
diff --git a/quic/core/http/http_constants.h b/quic/core/http/http_constants.h
index 84d0abd..9c2c6b5 100644
--- a/quic/core/http/http_constants.h
+++ b/quic/core/http/http_constants.h
@@ -36,6 +36,10 @@
 // SETTINGS_QPACK_MAX_TABLE_CAPACITY.
 const QuicByteCount kDefaultQpackMaxDynamicTableCapacity = 64 * 1024;  // 64 KB
 
+// Default limit on number of blocked streams, communicated via
+// SETTINGS_QPACK_BLOCKED_STREAMS.
+const uint64_t kDefaultMaximumBlockedStreams = 100;
+
 }  // namespace quic
 
 #endif  // QUICHE_QUIC_CORE_HTTP_HTTP_CONSTANTS_H_