Use overloaded operators with QuicTime for addition, subtraction and scalar

net/quic/congestion_control/pacing_sender.cc

Index: net/quic/congestion_control/pacing_sender.cc
diff --git a/net/quic/congestion_control/pacing_sender.cc b/net/quic/congestion_control/pacing_sender.cc
index 0f0ef3af5ebf096077f091b3a4846d677a0f9a11..7f366c93cd1d75d955f680c9f88d8b18150bfc59 100644
--- a/net/quic/congestion_control/pacing_sender.cc
+++ b/net/quic/congestion_control/pacing_sender.cc
@@ -91,12 +91,12 @@ bool PacingSender::OnPacketSent(
   // If the last send was delayed, and the alarm took a long time to get
   // invoked, allow the connection to make up for lost time.
   if (was_last_send_delayed_) {
-    ideal_next_packet_send_time_ = ideal_next_packet_send_time_.Add(delay);
+    ideal_next_packet_send_time_ = ideal_next_packet_send_time_ + delay;
     // The send was application limited if it takes longer than the
     // pacing delay between sent packets.
     const bool application_limited =
         last_delayed_packet_sent_time_.IsInitialized() &&
-        sent_time > last_delayed_packet_sent_time_.Add(delay);
+        sent_time > last_delayed_packet_sent_time_ + delay;
     const bool making_up_for_lost_time =
         ideal_next_packet_send_time_ <= sent_time;
     // As long as we're making up time and not application limited,
@@ -109,8 +109,8 @@ bool PacingSender::OnPacketSent(
       last_delayed_packet_sent_time_ = QuicTime::Zero();
     }
   } else {
-    ideal_next_packet_send_time_ = QuicTime::Max(
-        ideal_next_packet_send_time_.Add(delay), sent_time.Add(delay));
+    ideal_next_packet_send_time_ =
+        QuicTime::Max(ideal_next_packet_send_time_ + delay, sent_time + delay);
   }
   return in_flight;
 }
@@ -140,11 +140,11 @@ QuicTime::Delta PacingSender::TimeUntilSend(
   }
 
   // If the next send time is within the alarm granularity, send immediately.
-  if (ideal_next_packet_send_time_ > now.Add(alarm_granularity_)) {
+  if (ideal_next_packet_send_time_ > now + alarm_granularity_) {
     DVLOG(1) << "Delaying packet: "
-             << ideal_next_packet_send_time_.Subtract(now).ToMicroseconds();
+             << (ideal_next_packet_send_time_ - now).ToMicroseconds();
     was_last_send_delayed_ = true;
-    return ideal_next_packet_send_time_.Subtract(now);
+    return ideal_next_packet_send_time_ - now;
   }
 
   DVLOG(1) << "Sending packet now";