Port #11712: Fix the nanopb's header include issue

C# treat compiler warnings as error.

auto_set_flakes should respect platform

Bump protobuf to 3.4.0rc3

Flow Control Part 2: BDP

Fix windows performance benchmarks

Delete deprecated constructor and CallOpSetCollection

Regenerate projects when testing using a submodule at head

Fixed off by one error in detect flakes script

Improvements to flake detection query

Upload results for Kokoro master portability tests

Correct no_report_files_found and error fields

ObjC test cleanup

Fix thread avalance in thread manager

PHP: update codegen plugin to support php_namespace option

Fix use-after-free in oauth2_credentials