Land Recent QUIC Changes.

net/quic/quic_framer.cc

Index: net/quic/quic_framer.cc
diff --git a/net/quic/quic_framer.cc b/net/quic/quic_framer.cc
index 244326393303603e8e18b5a08ee8f4572822ffb4..a49e6a9920428c6f3a452c7b5806843fc6800fce 100644
--- a/net/quic/quic_framer.cc
+++ b/net/quic/quic_framer.cc
@@ -1957,6 +1957,8 @@ bool QuicFramer::AppendAckFramePayloadV11(
   }
   uint32 delta_time_largest_observed_us = kInvalidDeltaTime;
   if (!frame.received_info.delta_time_largest_observed.IsInfinite()) {
+    DCHECK_LE(0u,
+              frame.received_info.delta_time_largest_observed.ToMicroseconds());
     delta_time_largest_observed_us =
         frame.received_info.delta_time_largest_observed.ToMicroseconds();
   }
@@ -2095,6 +2097,8 @@ bool QuicFramer::AppendAckFramePayloadAndTypeByte(
 
   uint64 delta_time_largest_observed_us = kUFloat16MaxValue;
   if (!received_info.delta_time_largest_observed.IsInfinite()) {
+    DCHECK_LE(0u,
+              frame.received_info.delta_time_largest_observed.ToMicroseconds());
     delta_time_largest_observed_us =
         received_info.delta_time_largest_observed.ToMicroseconds();
   }