Make QuicPacketCreator be able to serialize packet itself when it does not have room for next strea…

net/quic/quic_packet_generator_test.cc

Index: net/quic/quic_packet_generator_test.cc
diff --git a/net/quic/quic_packet_generator_test.cc b/net/quic/quic_packet_generator_test.cc
index 0dcf22918e23eb790216dab961bacec2919d4467..2c9487ae2bcdc17a9a41a0fd8da3450923778518 100644
--- a/net/quic/quic_packet_generator_test.cc
+++ b/net/quic/quic_packet_generator_test.cc
@@ -716,12 +716,14 @@ TEST_P(QuicPacketGeneratorTest, ConsumeData_FramesPreviouslyQueued) {
   EXPECT_TRUE(generator_.HasQueuedFrames());
 
   // This frame will not fit with the existing frame, causing the queued frame
-  // to be serialized, and it will not fit with another frame like it, so it is
-  // serialized by itself.
+  // to be serialized, and it will be added to a new open packet.
   consumed = generator_.ConsumeData(kHeadersStreamId, MakeIOVector("bar"), 3,
                                     true, MAY_FEC_PROTECT, nullptr);
   EXPECT_EQ(3u, consumed.bytes_consumed);
   EXPECT_TRUE(consumed.fin_consumed);
+  EXPECT_TRUE(generator_.HasQueuedFrames());
+
+  creator_->Flush();
   EXPECT_FALSE(generator_.HasQueuedFrames());
 
   PacketContents contents;