diff --git a/quic/core/http/quic_spdy_session.cc b/quic/core/http/quic_spdy_session.cc
index ece418c..f3c96e9 100644
--- a/quic/core/http/quic_spdy_session.cc
+++ b/quic/core/http/quic_spdy_session.cc
@@ -920,7 +920,9 @@
     return false;
   }
 
-  // TODO(b/153726130): Add OnSettingsFrameResumed() in debug visitor.
+  if (debug_visitor_ != nullptr) {
+    debug_visitor_->OnSettingsFrameResumed(out);
+  }
   for (const auto& setting : out.values) {
     OnSetting(setting.first, setting.second);
   }
@@ -1412,6 +1414,13 @@
       quiche::QuicheStrCat(type, " stream is received twice."));
 }
 
+void QuicSpdySession::OnZeroRttRejected() {
+  if (debug_visitor_ != nullptr) {
+    debug_visitor_->OnZeroRttRejected();
+  }
+  QuicSession::OnZeroRttRejected();
+}
+
 // static
 void QuicSpdySession::LogHeaderCompressionRatioHistogram(
     bool using_qpack,
diff --git a/quic/core/http/quic_spdy_session.h b/quic/core/http/quic_spdy_session.h
index 7e56b27..5c5758b 100644
--- a/quic/core/http/quic_spdy_session.h
+++ b/quic/core/http/quic_spdy_session.h
@@ -130,6 +130,10 @@
       QuicStreamId
       /*push_id*/,
       const spdy::SpdyHeaderBlock& /*header_block*/) {}
+
+  // 0-RTT related events.
+  virtual void OnSettingsFrameResumed(const SettingsFrame& /*frame*/) {}
+  virtual void OnZeroRttRejected() {}
 };
 
 // A QUIC session for HTTP.
@@ -387,6 +391,9 @@
   // Decode SETTINGS from |cached_state| and apply it to the session.
   bool ResumeApplicationState(ApplicationState* cached_state) override;
 
+  // Let the debug visitor know that 0-RTT is rejected.
+  void OnZeroRttRejected() override;
+
  protected:
   // Override CreateIncomingStream(), CreateOutgoingBidirectionalStream() and
   // CreateOutgoingUnidirectionalStream() with QuicSpdyStream return type to