target public_headers_must_be_c89 (test/core/surface/public_headers_must_be_c89.c) does not name header grpc/grpc_cronet.h as a dependency

You need to remove the grpc_cronet.h include from test/core/surface/public_headers_must_be_c89.c

LGTM. This has already been cherrypicked in the import.

test this please

@jcanizales can you LGTM and merge?

Can you describe in the top-level message what the changes are doing?

BTW, remember that we are still not merging ourselves. We are still adding the "ready to merge" label.

@jcanizales ping?

Please add a TODO in GRPCChannel.h to move the Cronet-specific methods into a separate file (a category of GRPCChannel, as we do with GRPCCall).

I still don't know what the changes in build.yaml are for, as they're not self-evident, but I trust @dgquintas already reviewed them.

Other than that, LGTM