Add a LOG(DFATAL) if the sequence number length is too small to fit the

net/quic/quic_framer_test.cc

Index: net/quic/quic_framer_test.cc
diff --git a/net/quic/quic_framer_test.cc b/net/quic/quic_framer_test.cc
index d51565e0c3299518309101d2333d9f4d0d65b858..b4c2b85a8312b6b920cca4c4e4984b6cc35a60f0 100644
--- a/net/quic/quic_framer_test.cc
+++ b/net/quic/quic_framer_test.cc
@@ -4582,7 +4582,7 @@ TEST_P(QuicFramerTest, Truncation) {
 
   QuicAckFrame ack_frame;
   ack_frame.received_info.largest_observed = 601;
-  ack_frame.sent_info.least_unacked = 0;
+  ack_frame.sent_info.least_unacked = header.packet_sequence_number - 1;
   for (uint64 i = 1; i < ack_frame.received_info.largest_observed; i += 2) {
     ack_frame.received_info.missing_packets.insert(i);
   }
@@ -4606,7 +4606,8 @@ TEST_P(QuicFramerTest, Truncation) {
   ASSERT_TRUE(framer_.ProcessPacket(*ack_packet));
   ASSERT_EQ(1u, visitor_.ack_frames_.size());
   const QuicAckFrame& processed_ack_frame = *visitor_.ack_frames_[0];
-  EXPECT_EQ(0u, processed_ack_frame.sent_info.least_unacked);
+  EXPECT_EQ(header.packet_sequence_number - 1,
+            processed_ack_frame.sent_info.least_unacked);
   EXPECT_TRUE(processed_ack_frame.received_info.is_truncated);
   EXPECT_EQ(510u, processed_ack_frame.received_info.largest_observed);
   ASSERT_EQ(255u, processed_ack_frame.received_info.missing_packets.size());
@@ -4630,7 +4631,7 @@ TEST_P(QuicFramerTest, CleanTruncation) {
 
   QuicAckFrame ack_frame;
   ack_frame.received_info.largest_observed = 201;
-  ack_frame.sent_info.least_unacked = 0;
+  ack_frame.sent_info.least_unacked = header.packet_sequence_number - 2;
   for (uint64 i = 1; i < ack_frame.received_info.largest_observed; ++i) {
     ack_frame.received_info.missing_packets.insert(i);
   }