Useful for situations where we need to repeatedly trylock, not useful
for cases where we need to lock (due to spinning).

Add a variant of sync_test to test it (with the same tests we run for
gpr_mu).

Add a benchmark to bm_closure to demonstrate single threaded performance.

Display logs when running interop based tests

Fix uploader

Add benchmarks for metadata operations

Add benchmarks for HTTP2 HPACK encoding

Increase timeout for bm_fullstack

Add grpc_load_reporting to grpc_cronet

Fix closure running: current code is unsafe

Fix interop HTML report

Bazel BUILD files tests under `test/core/surface` and `test/cpp/end2end`

Reduce mutexes in grpc_fd  read_closure/write_closure/shutdown paths (epoll engine only)

Add experimental CI job to run sanity tests

Make load balancers use combiner locks

Upmerge from 1.1.x

Let ServerContext own the initial_metadata array for sync calls

Reduce running time of internally run fuzzers

Add a benchmark for various operations on grpc_error