message: PCLF: Reserve vector before pushing.
  Cr-Commit-Position: refs/heads/main@{#36686}
diff: @@ -422,6 +422,7 @@ class PeerConnectionE2EQualityTestFixture {
  // subscribed to with specific resolution.
  std::vector<std::string> GetSubscribedPeers() const {
  std::vector<std::string> subscribed_streams;
  + subscribed_streams.reserve(peers_resolution_.size());
  for (const auto& entry : peers_resolution_) {
  subscribed_streams.push_back(entry.first);
  }
  