Export primary insecure and secure QUIC config id via internal server

net/quic/crypto/quic_crypto_server_config.h

Index: net/quic/crypto/quic_crypto_server_config.h
diff --git a/net/quic/crypto/quic_crypto_server_config.h b/net/quic/crypto/quic_crypto_server_config.h
index 4da3ce42718b05e095c4c1722cfaa79894c77078..0b76268e3b5ed3d6a887d7609cb239c620457ab2 100644
--- a/net/quic/crypto/quic_crypto_server_config.h
+++ b/net/quic/crypto/quic_crypto_server_config.h
@@ -39,6 +39,14 @@ namespace test {
 class QuicCryptoServerConfigPeer;
 }  // namespace test
 
+// Hook that allows application code to subscribe to primary config changes.
+class PrimaryConfigChangedCallback {
+ public:
+  PrimaryConfigChangedCallback();
+  virtual ~PrimaryConfigChangedCallback();
+  virtual void Run(const std::string& scid) = 0;
+};
+
 // Callback used to accept the result of the |client_hello| validation step.
 class NET_EXPORT_PRIVATE ValidateClientHelloResultCallback {
  public:
@@ -257,6 +265,9 @@ class NET_EXPORT_PRIVATE QuicCryptoServerConfig {
   // uniqueness.
   void set_server_nonce_strike_register_window_secs(uint32 window_secs);
 
+  // Set and take ownership of the callback to invoke on primary config changes.
+  void AcquirePrimaryConfigChangedCb(PrimaryConfigChangedCallback* cb);
+
  private:
   friend class test::QuicCryptoServerConfigPeer;
 
@@ -385,6 +396,8 @@ class NET_EXPORT_PRIVATE QuicCryptoServerConfig {
   // next_config_promotion_time_ contains the nearest, future time when an
   // active config will be promoted to primary.
   mutable QuicWallTime next_config_promotion_time_;
+  // Callback to invoke when the primary config changes.
+  scoped_ptr<PrimaryConfigChangedCallback> primary_config_changed_cb_;
 
   // Protects access to the pointer held by strike_register_client_.
   mutable base::Lock strike_register_client_lock_;