Bring back InterArrivalReceiver and rename it to TimestampeReceiver.

net/quic/congestion_control/timestamp_receiver.cc

Index: net/quic/congestion_control/timestamp_receiver.cc
diff --git a/net/quic/congestion_control/timestamp_receiver.cc b/net/quic/congestion_control/timestamp_receiver.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ad4407c1ad2370ecf851daf7a0563f07847f7da3
--- /dev/null
+++ b/net/quic/congestion_control/timestamp_receiver.cc
@@ -0,0 +1,43 @@
+// Copyright 2014 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/quic/congestion_control/timestamp_receiver.h"
+
+#include <utility>
+
+#include "base/basictypes.h"
+
+namespace net {
+
+TimestampReceiver::TimestampReceiver() {
+}
+
+TimestampReceiver::~TimestampReceiver() {
+}
+
+bool TimestampReceiver::GenerateCongestionFeedback(
+    QuicCongestionFeedbackFrame* feedback) {
+  if (received_packet_times_.size() <= 1) {
+    // Don't waste resources by sending a feedback frame for only one packet.
+    return false;
+  }
+  feedback->type = kTimestamp;
+
+  // Copy our current receive set to our feedback message, we will not resend
+  // this data if it is lost.
+  feedback->timestamp.received_packet_times = received_packet_times_;
+
+  // Prepare for the next set of arriving packets by clearing our current set.
+  received_packet_times_.clear();
+  return true;
+}
+
+void TimestampReceiver::RecordIncomingPacket(
+    QuicByteCount /*bytes*/,
+    QuicPacketSequenceNumber sequence_number,
+    QuicTime timestamp) {
+  received_packet_times_.insert(std::make_pair(sequence_number, timestamp));
+}
+
+}  // namespace net