[Not for review] Add TRACE_EVENTs and chrome://flags for preconnect

net/quic/core/quic_crypto_client_stream.cc

Index: net/quic/core/quic_crypto_client_stream.cc
diff --git a/net/quic/core/quic_crypto_client_stream.cc b/net/quic/core/quic_crypto_client_stream.cc
index 837ebeb5da7a20324968449d237829753f61e175..5b023f76a46f6fb85f63c830228d905271a6b38c 100644
--- a/net/quic/core/quic_crypto_client_stream.cc
+++ b/net/quic/core/quic_crypto_client_stream.cc
@@ -8,6 +8,7 @@
 
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/sparse_histogram.h"
+#include "base/trace_event/trace_event.h"
 #include "net/quic/core/crypto/crypto_protocol.h"
 #include "net/quic/core/crypto/crypto_utils.h"
 #include "net/quic/core/crypto/null_encrypter.h"
@@ -117,6 +118,8 @@ QuicCryptoClientStream::~QuicCryptoClientStream() {
 
 void QuicCryptoClientStream::OnHandshakeMessage(
     const CryptoHandshakeMessage& message) {
+  TRACE_EVENT1("net", "QuicCryptoClientStream::OnHandshakeMessage", "host",
+               server_id_.host());
   QuicCryptoClientStreamBase::OnHandshakeMessage(message);
 
   if (message.tag() == kSCUP) {
@@ -192,6 +195,8 @@ void QuicCryptoClientStream::HandleServerConfigUpdateMessage(
 }
 
 void QuicCryptoClientStream::DoHandshakeLoop(const CryptoHandshakeMessage* in) {
+  TRACE_EVENT1("net", "QuicCryptoClientStream::DoHandshakeLoop", "host",
+               server_id_.host());
   QuicCryptoClientConfig::CachedState* cached =
       crypto_config_->LookupOrCreate(server_id_);
 
@@ -261,6 +266,8 @@ void QuicCryptoClientStream::DoInitialize(
 
 void QuicCryptoClientStream::DoSendCHLO(
     QuicCryptoClientConfig::CachedState* cached) {
+  TRACE_EVENT1("net", "QuicCryptoClientStream::DoSendCHLO", "host",
+               server_id_.host());
   if (stateless_reject_received_) {
     // If we've gotten to this point, we've sent at least one hello
     // and received a stateless reject in response.  We cannot
@@ -447,6 +454,8 @@ void QuicCryptoClientStream::DoReceiveREJ(
 
 QuicAsyncStatus QuicCryptoClientStream::DoVerifyProof(
     QuicCryptoClientConfig::CachedState* cached) {
+  TRACE_EVENT1("net", "QuicCryptoClientStream::DoVerifyProof", "host",
+               server_id_.host());
   ProofVerifier* verifier = crypto_config_->proof_verifier();
   DCHECK(verifier);
   next_state_ = STATE_VERIFY_PROOF_COMPLETE;