Fix crash which happens when there's reordering in the beginning of a call.

webrtc/modules/remote_bitrate_estimator/remote_estimator_proxy_unittest.cc

 /*
  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 30 matching lines @@
     proxy_.IncomingPacket(time_ms, kDefaultPacketSize, header);
   }
 
   void Process() {
     clock_.AdvanceTimeMilliseconds(
         RemoteEstimatorProxy::kDefaultProcessIntervalMs);
     proxy_.Process();
   }
 
   SimulatedClock clock_;
-  MockPacketRouter router_;
+  testing::StrictMock<MockPacketRouter> router_;
   RemoteEstimatorProxy proxy_;
 
   const size_t kDefaultPacketSize = 100;
   const uint32_t kMediaSsrc = 456;
   const uint16_t kBaseSeq = 10;
   const int64_t kBaseTimeMs = 123;
   const int64_t kMaxSmallDeltaMs =
       (rtcp::TransportFeedback::kDeltaScaleFactor * 0xFF) / 1000;
 };
 
@@ skipping 156 matching lines @@
         EXPECT_EQ(1u, delta_vec.size());
         EXPECT_EQ(kBaseTimeMs + kTooLargeDelta,
                   (packet->GetBaseTimeUs() + delta_vec[0]) / 1000);
         return true;
       }))
       .RetiresOnSaturation();
 
   Process();
 }
 
+TEST_F(RemoteEstimatorProxyTest, GracefullyHandlesReorderingAndWrap) {
+  const int64_t kDeltaMs = 1000;
+  const uint16_t kLargeSeq = 62762;
+  IncomingPacket(kBaseSeq, kBaseTimeMs);
+  IncomingPacket(kLargeSeq, kBaseTimeMs + kDeltaMs);
+
+  EXPECT_CALL(router_, SendFeedback(_))
+      .Times(1)
+      .WillOnce(Invoke([this](rtcp::TransportFeedback* packet) {
+        packet->Build();
+        EXPECT_EQ(kBaseSeq, packet->GetBaseSequence());
+        EXPECT_EQ(kMediaSsrc, packet->GetMediaSourceSsrc());
+
+        std::vector<int64_t> delta_vec = packet->GetReceiveDeltasUs();
+        EXPECT_EQ(1u, delta_vec.size());
+        EXPECT_EQ(kBaseTimeMs, (packet->GetBaseTimeUs() + delta_vec[0]) / 1000);
+        return true;
+      }));
+
+  Process();
+}
+
 TEST_F(RemoteEstimatorProxyTest, ResendsTimestampsOnReordering) {
   IncomingPacket(kBaseSeq, kBaseTimeMs);
   IncomingPacket(kBaseSeq + 2, kBaseTimeMs + 2);
 
   EXPECT_CALL(router_, SendFeedback(_))
       .Times(1)
       .WillOnce(Invoke([this](rtcp::TransportFeedback* packet) {
         packet->Build();
         EXPECT_EQ(kBaseSeq, packet->GetBaseSequence());
         EXPECT_EQ(kMediaSsrc, packet->GetMediaSourceSsrc());
@@ skipping 85 matching lines @@
                   (packet->GetBaseTimeUs() + delta_vec[0]) / 1000);
         EXPECT_EQ(kTimeoutTimeMs - kBaseTimeMs, delta_vec[1] / 1000);
         EXPECT_EQ(1, delta_vec[2] / 1000);
         return true;
       }));
 
   Process();
 }
 
 }  // namespace webrtc