chore: import upstream snapshot with attribution

third_party/libprotobuf_mutator/BUILD

@@ -0,0 +1 @@
+# copybara:uncomment package(default_applicable_licenses = ["//tensorflow:license"])

third_party/libprotobuf_mutator/libprotobuf_mutator.BUILD

@@ -0,0 +1,37 @@
+licenses(["notice"])  # Apache
+
+exports_files(["LICENSE"])
+
+cc_library(
+    name = "libprotobuf_mutator_internals",
+    srcs = [
+        "src/binary_format.cc",
+        "src/field_instance.h",
+        "src/libfuzzer/libfuzzer_macro.cc",
+        "src/libfuzzer/libfuzzer_mutator.cc",
+        "src/mutator.cc",
+        "src/text_format.cc",
+        "src/utf8_fix.cc",
+        "src/weighted_reservoir_sampler.h",
+    ],
+    hdrs = [
+        "port/protobuf.h",
+        "src/binary_format.h",
+        "src/libfuzzer/libfuzzer_macro.h",
+        "src/libfuzzer/libfuzzer_mutator.h",
+        "src/mutator.h",
+        "src/random.h",
+        "src/text_format.h",
+        "src/utf8_fix.h",
+    ],
+    includes = ["."],
+    deps = ["@com_google_protobuf//:protobuf"],
+)
+
+cc_library(
+    name = "libprotobuf_mutator",
+    hdrs = ["src/libfuzzer/libfuzzer_macro.h"],
+    includes = ["."],
+    visibility = ["//visibility:public"],
+    deps = [":libprotobuf_mutator_internals"],
+)

third_party/libprotobuf_mutator/workspace.bzl

@@ -0,0 +1,13 @@
+"""Provides the repo macro to import google libprotobuf_mutator"""
+
+load("//third_party:repo.bzl", "tf_http_archive", "tf_mirror_urls")
+
+def repo():
+    """Imports libprotobuf_mutator."""
+    tf_http_archive(
+        name = "com_google_libprotobuf_mutator",
+        sha256 = "792f250fb546bde8590e72d64311ea00a70c175fd77df6bb5e02328fa15fe28e",
+        strip_prefix = "libprotobuf-mutator-1.0",
+        build_file = "//third_party/libprotobuf_mutator:libprotobuf_mutator.BUILD",
+        urls = tf_mirror_urls("https://github.com/google/libprotobuf-mutator/archive/v1.0.tar.gz"),
+    )