Add debugging logs for Priority frames. gfe-relnote: v99 only, not in prod. PiperOrigin-RevId: 259423115 Change-Id: I1c67ed93a229f75a8a746b3d68f24efb1f902811

diff --git a/quic/core/http/http_frames.h b/quic/core/http/http_frames.h
index ac590e6..ced2032 100644
--- a/quic/core/http/http_frames.h
+++ b/quic/core/http/http_frames.h

@@ -80,6 +80,20 @@
            element_dependency_id == rhs.element_dependency_id &&
            weight == rhs.weight;
   }
+  std::string ToString() const {
+    return QuicStrCat("Priority Frame : {prioritized_type: ", prioritized_type,
+                      ", dependency_type: ", dependency_type,
+                      ", exclusive: ", exclusive,
+                      ", prioritized_element_id: ", prioritized_element_id,
+                      ", element_dependency_id: ", element_dependency_id,
+                      ", weight: ", weight, "}");
+  }
+
+  friend QUIC_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& os,
+                                                      const PriorityFrame& s) {
+    os << s.ToString();
+    return os;
+  }
 };
 
 // 4.2.4.  CANCEL_PUSH

diff --git a/quic/core/http/quic_send_control_stream.cc b/quic/core/http/quic_send_control_stream.cc
index a53f931..348f63d 100644
--- a/quic/core/http/quic_send_control_stream.cc
+++ b/quic/core/http/quic_send_control_stream.cc

@@ -59,6 +59,7 @@
   std::unique_ptr<char[]> buffer;
   QuicByteCount frame_length =
       encoder_.SerializePriorityFrame(priority, &buffer);
+  QUIC_DVLOG(1) << "Control Stream " << id() << " is writing " << priority;
   WriteOrBufferData(QuicStringPiece(buffer.get(), frame_length), false,
                     nullptr);
 }