Add QuicSentPacketManagerInterface, and QuicSentPacketManager implements it. No functional change e…

net/quic/quic_protocol.h

Index: net/quic/quic_protocol.h
diff --git a/net/quic/quic_protocol.h b/net/quic/quic_protocol.h
index 7ea471b68f3ae6136dc26a3da751c4e7b48e0cc5..57ba0003ffe6a8fba633583af509cc7b216e2f19 100644
--- a/net/quic/quic_protocol.h
+++ b/net/quic/quic_protocol.h
@@ -186,6 +186,11 @@ const int kMaxAvailableStreamsMultiplier = 10;
 // create available streams entries.
 const int kMaxPromisedStreamsMultiplier = kMaxAvailableStreamsMultiplier - 1;
 
+// TCP RFC calls for 1 second RTO however Linux differs from this default and
+// define the minimum RTO to 200ms, we will use the same until we have data to
+// support a higher or lower value.
+static const int64_t kMinRetransmissionTimeMs = 200;
+
 // We define an unsigned 16-bit floating point value, inspired by IEEE floats
 // (http://en.wikipedia.org/wiki/Half_precision_floating-point_format),
 // with 5-bit exponent (bias 1), 11-bit mantissa (effective 12 with hidden