update build rules

src/google/protobuf/util/BUILD.bazel

@@ -112,6 +112,20 @@ cc_test(
     ],
 )
 
+cc_library(
+    name = "zero_copy_sink",
+    srcs = ["zero_copy_sink.cc"],
+    hdrs = ["zero_copy_sink.h"],
+    copts = COPTS,
+    strip_include_prefix = "/src",
+    visibility = ["//visibility:private"],
+    deps = [
+        "//src/google/protobuf",
+        "//src/google/protobuf/io",
+        "//src/google/protobuf/stubs",
+    ],
+)
+
 cc_library(
     name = "json_util",
     srcs = ["json_util.cc"],
@@ -121,6 +135,7 @@ cc_library(
     visibility = ["//:__subpackages__"],
     deps = [
         ":type_resolver_util",
+        ":zero_copy_sink",
         "//src/google/protobuf",
         "//src/google/protobuf/io",
         "//src/google/protobuf/stubs",
@@ -131,6 +146,18 @@ cc_library(
     ],
 )
 
+cc_test(
+    name = "zero_copy_sink_test",
+    srcs = ["zero_copy_sink_test.cc"],
+    copts = COPTS,
+    deps = [
+        ":zero_copy_sink",
+        "//src/google/protobuf/stubs",
+        "@com_google_googletest//:gtest",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
 cc_test(
     name = "json_util_test",
     srcs = ["json_util_test.cc"],