Change QUIC's pacer to allow a 10 packet burst when the connection comes

net/quic/quic_sent_packet_manager.cc

Index: net/quic/quic_sent_packet_manager.cc
diff --git a/net/quic/quic_sent_packet_manager.cc b/net/quic/quic_sent_packet_manager.cc
index 565797fcc9fdf1339e9bfd9de51be58e8e9593a0..5705c0b03b5c7eb3a7e7b3e312897b5697f98646 100644
--- a/net/quic/quic_sent_packet_manager.cc
+++ b/net/quic/quic_sent_packet_manager.cc
@@ -41,6 +41,9 @@ static const int64 kMinTailLossProbeTimeoutMs = 10;
 // Number of samples before we force a new recent min rtt to be captured.
 static const size_t kNumMinRttSamplesAfterQuiescence = 2;
 
+// Number of unpaced packets to send after quiescence.
+static const size_t kInitialUnpacedBurst = 10;
+
 bool HasCryptoHandshake(const TransmissionInfo& transmission_info) {
   if (transmission_info.retransmittable_frames == NULL) {
     return false;
@@ -808,7 +811,8 @@ void QuicSentPacketManager::MaybeEnablePacing() {
   using_pacing_ = true;
   send_algorithm_.reset(
       new PacingSender(send_algorithm_.release(),
-                       QuicTime::Delta::FromMilliseconds(5)));
+                       QuicTime::Delta::FromMilliseconds(5),
+                       kInitialUnpacedBurst));
 }
 
 }  // namespace net