Allow FakeNetworkPipe to drop packets in bursts.

webrtc/test/fake_network_pipe.h

Index: webrtc/test/fake_network_pipe.h
diff --git a/webrtc/test/fake_network_pipe.h b/webrtc/test/fake_network_pipe.h
index 608ff008c9919c4e23bc418806cd56f59fd58380..2dcbcf59d128fbf732adba4e373aeb352741c5e1 100644
--- a/webrtc/test/fake_network_pipe.h
+++ b/webrtc/test/fake_network_pipe.h
@@ -80,6 +80,8 @@ class FakeNetworkPipe {
     int loss_percent = 0;
     // If packets are allowed to be reordered.
     bool allow_reordering = false;
+    // The average length of a burst of lost packets.
+    int avg_burst_loss_length = -1;
   };
 
   FakeNetworkPipe(Clock* clock, const FakeNetworkPipe::Config& config);
@@ -133,6 +135,16 @@ class FakeNetworkPipe {
   size_t sent_packets_;
   int64_t total_packet_delay_;
 
+  // Are we currently dropping a burst of packets?
+  bool bursting_;
+
+  // The probability to drop the packet if we are currently dropping a
+  // burst of packet
+  double prob_loss_bursting_;
+
+  // The probability to drop a burst of packets.
+  double prob_start_bursting_;
+
   int64_t next_process_time_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(FakeNetworkPipe);