tree a4a145ed3437e12d0e195d02371c4b368ad43bd2
parent f2525060d246f1396eebb108031b936deb1a5fc4
author birenroy <birenroy@google.com> 1752255798 -0700
committer Copybara-Service <copybara-worker@google.com> 1752255847 -0700

Adds `Http2VisitorInterface` callbacks that report flow control exhaustion events.

* A "local" flow control exhaustion event indicates that this HTTP/2 endpoint can no longer send data because it has consumed all of the flow control quota granted by the peer.
* A "remote" flow control exhaustion event indicates that this endpoint believes the peer can no longer send data, based on the flow control quota granted and the `DATA` frames received.

Some users of the `oghttp2` library may be interested in detecting these events.

Protected by new observation hooks only; no change to protocol behavior.

PiperOrigin-RevId: 782034513