Use overloaded operators with QuicTime for addition, subtraction and scalar

net/tools/quic/test_tools/packet_dropping_test_writer.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/tools/quic/test_tools/packet_dropping_test_writer.h"
 
 #include <limits>
 
 #include "base/rand_util.h"
 #include "net/tools/quic/quic_epoll_connection_helper.h"
@@ skipping 100 matching lines @@
   }
 
   if (!fake_packet_delay_.IsZero() || !fake_bandwidth_.IsZero()) {
     if (buffer_size_ > 0 && buf_len + cur_buffer_size_ > buffer_size_) {
       // Drop packets which do not fit into the buffer.
       DVLOG(1) << "Dropping packet because the buffer is full.";
       return WriteResult(WRITE_STATUS_OK, buf_len);
     }
 
     // Queue it to be sent.
-    QuicTime send_time = clock_->ApproximateNow().Add(fake_packet_delay_);
+    QuicTime send_time = clock_->ApproximateNow() + fake_packet_delay_;
     if (!fake_bandwidth_.IsZero()) {
       // Calculate a time the bandwidth limit would impose.
       QuicTime::Delta bandwidth_delay = QuicTime::Delta::FromMicroseconds(
           (buf_len * kNumMicrosPerSecond) / fake_bandwidth_.ToBytesPerSecond());
       send_time = delayed_packets_.empty()
-                      ? send_time.Add(bandwidth_delay)
-                      : delayed_packets_.back().send_time.Add(bandwidth_delay);
+                      ? send_time + bandwidth_delay
+                      : delayed_packets_.back().send_time + bandwidth_delay;
     }
     std::unique_ptr<PerPacketOptions> delayed_options;
     if (options != nullptr) {
       delayed_options.reset(options->Clone());
     }
     delayed_packets_.push_back(
         DelayedWrite(buffer, buf_len, self_address, peer_address,
                      std::move(delayed_options), send_time));
     cur_buffer_size_ += buf_len;
 
@@ skipping 98 matching lines @@
 // IPAddress has no move assignment operator.
 //
 // PacketDroppingTestWriter::DelayedWrite&
 // PacketDroppingTestWriter::DelayedWrite::operator=(
 //    PacketDroppingTestWriter::DelayedWrite&& other) = default;
 
 PacketDroppingTestWriter::DelayedWrite::~DelayedWrite() {}
 
 }  // namespace test
 }  // namespace net