[Thirdparty] Upgrade protobuf to 3.9.2.

Signed-off-by: Tongxuan Liu <tongxuan.ltx@alibaba-inc.com>

tensorflow/tools/pip_package/setup.py

@@ -66,7 +66,7 @@
     'numpy >= 1.16.0, < 1.19.0',
     'opt_einsum >= 2.3.2',
     'six >= 1.10.0',
-    'protobuf >= 3.6.1',
+    'protobuf >= 3.9.2',
     'tensorboard >= 1.15.0, < 1.16.0',
     'tensorflow-estimator >= 1.15.1, < 1.15.5',
     'termcolor >= 1.1.0',

tensorflow/workspace.bzl

@@ -511,28 +511,19 @@ def tf_repositories(path_prefix = "", tf_repo_name = ""):
         },
     )
 
-    # 310ba5ee72661c081129eb878c1bbcec936b20f0 is based on 3.8.0 with a fix for protobuf.bzl.
-    PROTOBUF_URLS = [
-        "https://storage.googleapis.com/mirror.tensorflow.org/github.com/protocolbuffers/protobuf/archive/310ba5ee72661c081129eb878c1bbcec936b20f0.tar.gz",
-        "https://github.com/protocolbuffers/protobuf/archive/310ba5ee72661c081129eb878c1bbcec936b20f0.tar.gz",
-    ]
-    PROTOBUF_SHA256 = "b9e92f9af8819bbbc514e2902aec860415b70209f31dfc8c4fa72515a5df9d59"
-    PROTOBUF_STRIP_PREFIX = "protobuf-310ba5ee72661c081129eb878c1bbcec936b20f0"
-
-    # protobuf depends on @zlib, it has to be renamed to @zlib_archive because "zlib" is already
-    # defined using bind for grpc.
-    PROTOBUF_PATCH = "//third_party/protobuf:protobuf.patch"
-
     tf_http_archive(
         name = "com_google_protobuf",                        # MIT license
-        patch_file = [clean_dep(PROTOBUF_PATCH)],
-        sha256 = PROTOBUF_SHA256,
-        strip_prefix = PROTOBUF_STRIP_PREFIX,
+        patch_file = [clean_dep("//third_party/protobuf:protobuf.patch")],
+        sha256 = "cfcba2df10feec52a84208693937c17a4b5df7775e1635c1e3baffc487b24c9b",
+        strip_prefix = "protobuf-3.9.2",
         system_build_file = clean_dep("//third_party/systemlibs:protobuf.BUILD"),
         system_link_files = {
             "//third_party/systemlibs:protobuf.bzl": "protobuf.bzl",
         },
-        urls = PROTOBUF_URLS,
+        urls = [
+            "https://storage.googleapis.com/mirror.tensorflow.org/github.com/protocolbuffers/protobuf/archive/v3.9.2.zip",
+            "https://github.com/protocolbuffers/protobuf/archive/v3.9.2.zip",
+        ],
     )
 
     tf_http_archive(

third_party/protobuf/protobuf.patch

@@ -1,30 +1,43 @@
 diff --git a/BUILD b/BUILD
-index 2fb26050..c2744d5b 100644
+index dbae719ff..87dc38470 100644
 --- a/BUILD
 +++ b/BUILD
-@@ -19,7 +19,7 @@ config_setting(
+@@ -23,7 +23,7 @@ config_setting(
  # ZLIB configuration
  ################################################################################
- 
+
 -ZLIB_DEPS = ["@zlib//:zlib"]
-+ZLIB_DEPS = ["@zlib_archive//:zlib"]
- 
++ZLIB_DEPS = ["@zlib"]
+
  ################################################################################
  # Protobuf Runtime Library
-@@ -209,6 +209,7 @@ cc_library(
+@@ -143,6 +143,7 @@ cc_library(
      copts = COPTS,
      includes = ["src/"],
      linkopts = LINK_OPTS,
 +    alwayslink = 1,
      visibility = ["//visibility:public"],
-     deps = [":protobuf_lite"] + PROTOBUF_DEPS,
  )
-@@ -219,7 +220,7 @@ cc_library(
- # TODO(keveman): Remove this target once the support gets added to Bazel.
- cc_library(
-     name = "protobuf_headers",
--    hdrs = glob(["src/**/*.h"]),
-+    hdrs = glob(["src/**/*.h", "src/**/*.inc"]),
+
+@@ -213,6 +214,7 @@ cc_library(
+     copts = COPTS,
      includes = ["src/"],
+     linkopts = LINK_OPTS,
++    alwayslink = 1,
      visibility = ["//visibility:public"],
+     deps = [":protobuf_lite"] + PROTOBUF_DEPS,
  )
+diff --git a/protobuf.bzl b/protobuf.bzl
+index e0653321f..253d9cbb5 100644
+--- a/protobuf.bzl
++++ b/protobuf.bzl
+@@ -84,7 +84,9 @@ def _proto_gen_impl(ctx):
+
+     for dep in ctx.attr.deps:
+         import_flags += dep.proto.import_flags
+         deps += dep.proto.deps
++    import_flags = depset(import_flags).to_list()
++    deps = depset(deps).to_list()
+
+     if not ctx.attr.gen_cc and not ctx.attr.gen_py and not ctx.executable.plugin:
+         return struct(