Adds sequence numbers to feedback generator output.

Bug: webrtc:10498
Change-Id: I2bbda067b9936636088e3fdd52f6979f51eb3c84
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/149042
Reviewed-by: Jonas Olsson <jonasolsson@webrtc.org>
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28855}

test/network/feedback_generator.cc

@@ -39,6 +39,7 @@ void FeedbackGeneratorImpl::SendPacket(size_t size) {
   SentPacket sent;
   sent.send_time = Now();
   sent.size = DataSize::bytes(size);
+  sent.sequence_number = sequence_number_++;
   route_.SendRequest(size, sent);
 }
 

test/network/feedback_generator.h

@@ -52,6 +52,7 @@ class FeedbackGeneratorImpl
 
   TransportPacketsFeedback builder_;
   std::vector<TransportPacketsFeedback> feedback_;
+  int64_t sequence_number_ = 1;
 };
 }  // namespace webrtc
 #endif  // TEST_NETWORK_FEEDBACK_GENERATOR_H_