Grant Oakley

Throwing an exception from some StreamTracer methods hangs the RPC

10

### What version of gRPC-Java are you using? Head ### What is your environment? Android ### What did you expect to see? If a client-implemented `ClientStreamTracer` method throws an exception,...

## Summary This is a request to resolve [this TODO](https://github.com/grpc/grpc-java/blob/927d21541dbc34be245f09c8180358a94ae5c031/cronet/src/main/java/io/grpc/cronet/CronetClientStream.java#L365), and to use a better default User-Agent if none is provided to the `CronetChannelBuilder`. ## Problem If `CronetChannelBuilder` is used...