First version of a QUIC SendAlgorithmSimulator which is designed to

net/quic/test_tools/quic_test_utils.cc

Index: net/quic/test_tools/quic_test_utils.cc
diff --git a/net/quic/test_tools/quic_test_utils.cc b/net/quic/test_tools/quic_test_utils.cc
index 727c5446c8f0d75dee96f3ac0b91a64d2c84d5ce..85bdfbdccc63083f965004e6cfb5d04047fa3532 100644
--- a/net/quic/test_tools/quic_test_utils.cc
+++ b/net/quic/test_tools/quic_test_utils.cc
@@ -4,6 +4,7 @@
 
 #include "net/quic/test_tools/quic_test_utils.h"
 
+#include "base/sha1.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "net/quic/crypto/crypto_framer.h"
@@ -82,6 +83,14 @@ SerializedPacket BuildUnsizedDataPacket(QuicFramer* framer,
   return framer->BuildDataPacket(header, frames, packet_size);
 }
 
+uint64 SimpleRandom::RandUint64() {
+  unsigned char hash[base::kSHA1Length];
+  base::SHA1HashBytes(reinterpret_cast<unsigned char*>(&seed_), sizeof(seed_),
+                      hash);
+  memcpy(&seed_, hash, sizeof(seed_));
+  return seed_;
+}
+
 MockFramerVisitor::MockFramerVisitor() {
   // By default, we want to accept packets.
   ON_CALL(*this, OnProtocolVersionMismatch(_))