Modify build stats tool.

Add tags to anonymous structs and unions (makes FFI bindings easier)

Trace Closure Flush

Fix data races between cq-shutdown and cq-begin-op for a pluckable cq

Node: fix segfault with incorrect status argument types

Fixed `grpc_unsecure` CMake build failures due to non-standard ssl path.

Roll forward "Add TSI zero-copy frame protector"

Make bytes_to_send in tsi_handshaker_next const

Fix a thread safety bug in chttp2_transport

Fix Objc Readme for directory hierarchies

Fix a variable name in interop script

cancel calls on ruby client bidi write loop exceptions and surface the errror 

Revert "Add TSI zero-copy frame protector"

error

Add TSI zero-copy frame protector

`grpc_unsecure` doesn't use openssl, but one of its source file accidently
includes `openssl/rand.h`. Since `CMakeLists.txt` doesn't specify that
`grpc_unsecure` requires openssl, the build would fail. This can be fixed
by simply removing this header inclusion.

Fixed #11600.

Added flake detection script

Revert "Add OAuth2 protocol in GRPCClient"

Refcount grpc_alarm object so that grpc_alarm_destroy() can be safely called before cq-next()

Update epoll-polling-engine.md

Update tcp_server_utils_posix_common with GPR_ONCE_INIT

Add Slice constructors to match all grpc_slice cases

PHP: persistent channels

gRPC Python test infrastructure.

Remove gcloud auth activate-service-account from Kokoro Mac build

Add OAuth2 protocol in GRPCClient