Hello,

We have several questions related to gRPC C++ cronet channel.

1. Does cronet channel support retry? We followed the e2e test service 
retry example 
<https://github.com/grpc/grpc/blob/v1.33.x/test/core/end2end/tests/retry_recv_message.cc#L100>
  
and implemented gRPC retry. The retry works with http2/ssl channel but 
looks like retry doesn't work with cronet channel. We also want to confirm 
whether retry is officially supported from gRPC C++ core.

2. Does cronet channel support this grpc_channel_ping 
<https://github.com/grpc/grpc/blob/1835f00ef1fb41dc220db7885b5f6fa9e3123fae/src/core/lib/surface/channel.h#L171>
 API? The 
context is: we implemented a long lived bidi-streaming RPC call. There is a 
long period of idle when this RPC is alived. We want to periodically call 
this channel API to check if channel is health. We know keep alive is not 
supported by cronet channel. In addition, this grpc_channel_ping API has 
been removed from the latest release. We are wondering if there is any 
alternative ping API.

Thanks,
Qing

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