Bazel build for the combined GRPC runtime jar file

Change-Id: I76ff5f1b81a0985cb45c70c8f63640668207cd4e
diff --git a/WORKSPACE b/WORKSPACE
index a1f5382..4810fff 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -1,8 +1,10 @@
 load("//tools/build/bazel:generate_workspace.bzl", "generated_maven_jars")
 load("//tools/build/bazel:p4lang_workspace.bzl", "generate_p4lang")
+load("//tools/build/bazel:grpc_workspace.bzl", "generate_grpc")
 
 generated_maven_jars()
 generate_p4lang()
+generate_grpc()
 
 git_repository(
         name = "build_bazel_rules_nodejs",