Create no-src target for expanding visibility of TF deps.

PiperOrigin-RevId: 322278685
Change-Id: Id1295a5de3029ca874cd3908e3f09b5fef88bea7

tensorflow/python/tpu/BUILD

@@ -560,6 +560,13 @@ tpu_py_test(
     ],
 )
 
+# NOTE this target should only be depended on by the tpu_test_wrapper macro.
+py_library(
+    name = "tpu_test_deps",
+    visibility = ["//visibility:public"],
+    deps = ["//tensorflow/python:client_testlib"],
+)
+
 tf_proto_library(
     name = "tensor_tracer_proto",
     srcs = ["tensor_tracer.proto"],

tensorflow/python/tpu/tpu_test_wrapper.bzl

@@ -57,7 +57,7 @@ def get_kwargs_for_wrapping(
     kwargs["python_version"] = kwargs.get("python_version", "PY3")
     kwargs["srcs"] = [wrapper_src] + kwargs["srcs"]
     kwargs["deps"] = depset(
-        ["//tensorflow/python:client_testlib"],
+        ["//tensorflow/python/tpu:tpu_test_deps"],
         transitive = [deps],
     )
     kwargs["main"] = wrapper_src