chore: import upstream snapshot with attribution

tensorflow/tools/proto_splitter/python/BUILD

@@ -0,0 +1,68 @@
+# Description:
+#   Python library for splitting and joining large protos.
+load("//tensorflow:pytype.default.bzl", "pytype_strict_library")
+load("//tensorflow:tensorflow.bzl", "py_test")
+
+package(
+    # copybara:uncomment default_applicable_licenses = ["//tensorflow:license"],
+    default_visibility = ["//tensorflow:internal"],
+    licenses = ["notice"],
+)
+
+pytype_strict_library(
+    name = "saved_model",
+    srcs = ["saved_model.py"],
+    # NOTE(yibaimeng): To be removed when everything is migrated to `pywrap_saved_model.Save`.
+    visibility = [
+        "//tensorflow:internal",
+        "//waymo/ml/deploy/tensorflow:__pkg__",
+    ],
+    deps = [
+        "//tensorflow/core:protos_all_py",
+        "//tensorflow/tools/proto_splitter:constants",
+        "//tensorflow/tools/proto_splitter:split",
+        "//tensorflow/tools/proto_splitter:split_graph_def",
+    ],
+)
+
+py_test(
+    name = "saved_model_test",
+    srcs = ["saved_model_test.py"],
+    strict_deps = True,
+    tags = [
+        "no_mac",  # b/291933687
+        "no_windows",  # b/291001524
+    ],
+    deps = [
+        ":saved_model",
+        ":test_util",
+        #internal proto upb dep
+        "//tensorflow/core:protos_all_py",
+        "//tensorflow/python/platform:client_testlib",
+        "//tensorflow/tools/proto_splitter:constants",
+    ],
+)
+
+pytype_strict_library(
+    name = "test_util",
+    srcs = ["test_util.py"],
+    deps = [
+        "//tensorflow/core:protos_all_py",
+        "//tensorflow/python/framework:dtypes",
+        "//tensorflow/python/framework:tensor_util",
+        "//third_party/py/numpy",
+    ],
+)
+
+py_test(
+    name = "test_util_test",
+    srcs = ["test_util_test.py"],
+    strict_deps = True,
+    deps = [
+        #internal proto upb dep
+        "//tensorflow/python/framework:dtypes",
+        "//tensorflow/python/platform:client_testlib",
+        "//tensorflow/tools/proto_splitter/python:test_util",
+        "@absl_py//absl/testing:parameterized",
+    ],
+)