tree 9a2e9fe036c53a97ea29258685ce50d83d9918ac
parent a27fd44c5c53a67f3fa772b805363eff039411d5
author fkastenholz <fkastenholz@google.com> 1554811933 -0700
committer Copybara-Service <copybara-worker@google.com> 1554831213 -0700

Add datatypes needed for IETF CONNECTION_CLOSE support.

This CL adds datatypes that are needed to support IETF QUIC's CONNECTION_CLOSE.
The types are
 - union QuicConnectionCloseErrorCode: a union that allows the frame's error
   code field to be accessed using the correct type (QuicErrorCode,
   QuicIetfTransportErrorCode, or uint16_t), and
 - enum QuicConnectionCloseType: indicates the type of connection close
   (Google-QUIC, IETF QUIC Connection Close/Application, or IETF QUIC
   Connection Close/Transport).

QuicConnectionCloseFrame is updated to include these fields.
QuicFramer is updated to set them to reasonable defaults/etc.
Code that refers to QuicConnectionCloseFrame::error_code has been
modified to get the error code value from the QuicErrorCode member
of the QuicConnectionCloseErrorCode union.

There are no logic or functional changes.  Additional CLs will add the necessary functionality.

gfe-relnote: Not flag protected, all code changes due to field name/etc changes.

ENUM_VALUE_OK=This value change is OK, it is the maximum value/limit of the enum

The design, including rationale and approximate plan for Cls is in
https://docs.google.com/document/d/1LB1Dhyw7tVLmFFEqmW6_xxnNiExNtlShJXrNU3CDM0M/edit?usp=sharing

PiperOrigin-RevId: 242647040
Change-Id: I3e45879777d83e7a8aeb2e19257b8bafcd0101bd