Build fix: grpc needs build_bazel_apple_support.

WORKSPACE

@@ -39,6 +39,20 @@ http_archive(
     urls = ["https://github.com/google/benchmark/archive/master.zip"],
 )
 
+# Used by gRPC.
+http_archive(
+    name = "build_bazel_apple_support",
+    strip_prefix = "apple_support-master",
+    urls = ["https://github.com/bazelbuild/apple_support/archive/master.zip"],
+)
+
+load(
+    "@build_bazel_apple_support//lib:repositories.bzl",
+    "apple_support_dependencies",
+)
+
+apple_support_dependencies()
+
 # gRPC
 http_archive(
     name = "com_github_grpc_grpc",

tools/pin_deps.py

@@ -49,15 +49,20 @@ def workspace_rule(self):
                                         commit, sha256)
 
 
+# grep -A1 http_archive\( WORKSPACE
 PROJECTS = [
     GitHubProject('com_google_absl', 'abseil', 'abseil-cpp'),
     GitHubProject('com_google_googletest', 'google', 'googletest'),
     GitHubProject('com_github_google_benchmark', 'google', 'benchmark'),
+    GitHubProject('build_bazel_apple_support', 'bazelbuild', 'apple_support'),
     GitHubProject('com_github_grpc_grpc', 'grpc', 'grpc'),
     GitHubProject('com_github_jupp0r_prometheus_cpp', 'jupp0r', 'prometheus-cpp'),
     GitHubProject('com_github_curl', 'curl', 'curl'),
     GitHubProject('com_github_tencent_rapidjson', 'Tencent', 'rapidjson'),
     GitHubProject('com_google_googleapis', 'googleapis', 'googleapis'),
+    # io_bazel_rules_go is pinned.
+    GitHubProject('grpc_java', 'grpc', 'grpc-java'),
+    GitHubProject('io_opencensus_proto', 'census-instrumentation', 'opencensus-proto'),
 ]
 
 for project in PROJECTS: