Bring back InterArrivalReceiver and rename it to TimestampeReceiver.

net/quic/congestion_control/timestamp_receiver_test.cc

Index: net/quic/congestion_control/timestamp_receiver_test.cc
diff --git a/net/quic/congestion_control/timestamp_receiver_test.cc b/net/quic/congestion_control/timestamp_receiver_test.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2c477ea887b531653e97466c026cf1cc790a9727
--- /dev/null
+++ b/net/quic/congestion_control/timestamp_receiver_test.cc
@@ -0,0 +1,55 @@
+// 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 "base/logging.h"
+#include "net/quic/congestion_control/timestamp_receiver.h"
+#include "net/quic/test_tools/mock_clock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace net {
+namespace test {
+
+class TimestampReceiverTest : public ::testing::Test {
+ protected:
+  TimestampReceiver receiver_;
+  MockClock clock_;
+};
+
+TEST_F(TimestampReceiverTest, SimpleReceiver) {
+  QuicTime start = clock_.ApproximateNow();
+  QuicTime::Delta received_delta = QuicTime::Delta::FromMilliseconds(10);
+  clock_.AdvanceTime(received_delta);
+  QuicTime receive_timestamp = clock_.ApproximateNow();
+  receiver_.RecordIncomingPacket(1, 1, receive_timestamp);
+
+  QuicCongestionFeedbackFrame feedback;
+  // Do not generate a congestion feedback frame because it has only one packet.
+  ASSERT_FALSE(receiver_.GenerateCongestionFeedback(&feedback));
+
+  clock_.AdvanceTime(received_delta);
+  receive_timestamp = clock_.ApproximateNow();
+  // Packet not received; but rather revived by FEC.
+  receiver_.RecordIncomingPacket(1, 2, receive_timestamp);
+  clock_.AdvanceTime(received_delta);
+  receive_timestamp = clock_.ApproximateNow();
+  receiver_.RecordIncomingPacket(1, 3, receive_timestamp);
+
+  ASSERT_TRUE(receiver_.GenerateCongestionFeedback(&feedback));
+
+  EXPECT_EQ(kTimestamp, feedback.type);
+  EXPECT_EQ(3u, feedback.timestamp.received_packet_times.size());
+  TimeMap::iterator it = feedback.timestamp.received_packet_times.begin();
+  EXPECT_EQ(1u, it->first);
+  EXPECT_EQ(QuicTime::Delta::FromMilliseconds(10), it->second.Subtract(start));
+  it = feedback.timestamp.received_packet_times.begin();
+  ++it;
+  EXPECT_EQ(2u, it->first);
+  EXPECT_EQ(QuicTime::Delta::FromMilliseconds(20), it->second.Subtract(start));
+  ++it;
+  EXPECT_EQ(3u, it->first);
+  EXPECT_EQ(QuicTime::Delta::FromMilliseconds(30), it->second.Subtract(start));
+}
+
+}  // namespace test
+}  // namespace net