Use Cocoapods to manage nanopb

Add return code as a field in BQ results uplaod

Make various scripts use the same version of Node

Add a end2end test of cancel call

cmake: various fixes

Make CMake find_package work for preinstalled libprotobuf on Raspbian.

Improvements to C++ filter API

Expose :authority pseudo-header to Obj-C API.

Fix ruby artifact build on kokoro

Change default for SETTINGS_MAX_HEADER_LIST_SIZE from 16KiB to 8KiB.

Allow HTTP CONNECT handshaker to be used in http1 client.

Add c# test to demonstrate setting custom error details

Removed leftover debugging msg

Make grpc::Alarm non-copyable

Apply a few recent changes from the wire guide on grpc.io.

s/CURRENT_TIMESTAMP/_DATE/ in BQ, for caching

Fix musl Portability

Fix RR policy connectivity state upon subchannels shutdown

Add mac deps to build artifacts on kokoro

- Make sure all C-core parameters are passed into C++ methods.
- Add Destroy() methods for ChannelData and CallData.
- Use C++-style casts.
- Add 'extern "C"' to iomgr/closure.h, which is used in C++ filters.

Improvements to kokoro macos build

Add script for patching perf benchmark schema