tree 6e3512d47bf703d902a038296c35194a56b7a28c
parent fddd4ee6ac66443358907c1c3f4bf18df2db3dbe
author renjietang <renjietang@google.com> 1597097904 -0700
committer Copybara-Service <copybara-worker@google.com> 1597097938 -0700

Prevent QuicSession from directly accessing streams' flow controller.

This change provides the following advantages:
1. QuicSession is no longer able to go cross QuicStream to modify its flow controller, and is limited on what it can do with stream's flow controller.
2. QuicStream::IsFlowControlBlocked() can be potentially transitioned to a stream state.

This CL also removes some tests in quic_spdy_session_test that are redundant with quic_session_test.

No behavior change. not protected.

PiperOrigin-RevId: 325899044
Change-Id: I1b676da2736507aec0a4438afdbc596ca274ed13