Close connection when packet generator is trying to add a frame which

net/quic/core/quic_packet_generator_test.cc

Index: net/quic/core/quic_packet_generator_test.cc
diff --git a/net/quic/core/quic_packet_generator_test.cc b/net/quic/core/quic_packet_generator_test.cc
index 264b52a359021cb30d489c9e77e6441e47cff6d9..782d28ea26a2e8e4094d3c27743f7a57eb60b4b7 100644
--- a/net/quic/core/quic_packet_generator_test.cc
+++ b/net/quic/core/quic_packet_generator_test.cc
@@ -877,5 +877,21 @@ TEST_F(QuicPacketGeneratorTest, SetCurrentPath) {
   EXPECT_EQ(kTestPathId1, QuicPacketCreatorPeer::GetCurrentPath(creator_));
 }
 
+// Regression test for b/31486443.
+TEST_F(QuicPacketGeneratorTest, ConnectionCloseFrameLargerThanPacketSize) {
+  FLAGS_quic_close_connection_on_huge_frames = true;
+  delegate_.SetCanWriteAnything();
+  QuicConnectionCloseFrame* frame = new QuicConnectionCloseFrame();
+  frame->error_code = QUIC_PACKET_WRITE_ERROR;
+  char buf[2000];
+  StringPiece error_details(buf, 2000);
+  frame->error_details = error_details.as_string();
+  EXPECT_CALL(delegate_,
+              OnUnrecoverableError(QUIC_FAILED_TO_SERIALIZE_PACKET,
+                                   "Single frame cannot fit into a packet", _));
+  EXPECT_QUIC_BUG(generator_.AddControlFrame(QuicFrame(frame)), "");
+  EXPECT_TRUE(generator_.HasQueuedFrames());
+}
+
 }  // namespace test
 }  // namespace net