Add appropriate go_dependencies for the go proto generator plugin.

Change-Id: Ie5c8dade16b27d5620410b64bac55e988f6a58d6
diff --git a/protoc-gen-go/BUILD.gn b/protoc-gen-go/BUILD.gn
index 4734353..ecb05c6 100644
--- a/protoc-gen-go/BUILD.gn
+++ b/protoc-gen-go/BUILD.gn
@@ -8,7 +8,17 @@
 assert(current_toolchain == host_toolchain)
 
 go_binary("protoc-gen-go") {
-  gopackage = "protoc-gen-go"
+  gopackage = "github.com/golang/protobuf/protoc-gen-go"
+  go_dependencies = [
+    {
+      package = "github.com/golang/protobuf/proto"
+      source = "//third_party/golibs/github.com/golang/protobuf/proto"
+    },
+    {
+      package = "github.com/golang/protobuf/protoc-gen-go"
+      source = "//third_party/golibs/github.com/golang/protobuf/protoc-gen-go"
+    },
+  ]
 }
 
 install_host_tools("host") {