Expect grpc_testing to be included in internal BUILD files. (#4203)
Expect grpc_testing to be included in internal BUILD files. (#4203)

Internal tests are broken by https://github.com/tensorflow/tensorboard/pull/4199. Internally we expect grpc_testing to be an explicit dependency in the BUILD file.

Use appropriate placeholder BUILD dependency.

tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard