registered toolchain and platform

WORKSPACE

@@ -1,45 +1,59 @@
-workspace(name="com_github_grpc_grpc")
+workspace(name = "com_github_grpc_grpc")
 
 load("//bazel:grpc_deps.bzl", "grpc_deps", "grpc_test_only_deps")
+
 grpc_deps()
+
 grpc_test_only_deps()
 
+register_execution_platforms(
+    "//third_party/toolchains:all",
+)
+
+register_toolchain(
+    "//third_party/toolchains:all",
+)
+
 new_http_archive(
-    name="cython",
-    sha256="d68138a2381afbdd0876c3cb2a22389043fa01c4badede1228ee073032b07a27",
-    urls=[
+    name = "cython",
+    build_file = "//third_party:cython.BUILD",
+    sha256 = "d68138a2381afbdd0876c3cb2a22389043fa01c4badede1228ee073032b07a27",
+    strip_prefix = "cython-c2b80d87658a8525ce091cbe146cb7eaa29fed5c",
+    urls = [
         "https://github.com/cython/cython/archive/c2b80d87658a8525ce091cbe146cb7eaa29fed5c.tar.gz",
     ],
-    strip_prefix="cython-c2b80d87658a8525ce091cbe146cb7eaa29fed5c",
-    build_file="//third_party:cython.BUILD",
 )
 
 load("//third_party/py:python_configure.bzl", "python_configure")
-python_configure(name="local_config_python")
+
+python_configure(name = "local_config_python")
 
 git_repository(
-    name="io_bazel_rules_python",
-    remote="https://github.com/bazelbuild/rules_python.git",
-    commit="8b5d0683a7d878b28fffe464779c8a53659fc645",
+    name = "io_bazel_rules_python",
+    commit = "8b5d0683a7d878b28fffe464779c8a53659fc645",
+    remote = "https://github.com/bazelbuild/rules_python.git",
 )
 
 load("@io_bazel_rules_python//python:pip.bzl", "pip_repositories", "pip_import")
 
 pip_repositories()
+
 pip_import(
-    name="grpc_python_dependencies",
-    requirements="//:requirements.bazel.txt",
+    name = "grpc_python_dependencies",
+    requirements = "//:requirements.bazel.txt",
 )
 
 load("@grpc_python_dependencies//:requirements.bzl", "pip_install")
+
 pip_install()
 
 # NOTE(https://github.com/pubref/rules_protobuf/pull/196): Switch to upstream repo after this gets merged.
 git_repository(
-    name="org_pubref_rules_protobuf",
-    remote="https://github.com/ghostwriternr/rules_protobuf",
-    tag="v0.8.2.1-alpha",
+    name = "org_pubref_rules_protobuf",
+    remote = "https://github.com/ghostwriternr/rules_protobuf",
+    tag = "v0.8.2.1-alpha",
 )
 
 load("@org_pubref_rules_protobuf//python:rules.bzl", "py_proto_repositories")
+
 py_proto_repositories()