Add GPU command buffer sevice and protobuf to GN build

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 4b392ac7f7f6821d6d5f396f67aefe0822326e4e..d56869ab6642998108bd1e49d523e0f925e9ebba 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -33,6 +33,7 @@ group("root") {
     "//device/usb",
     #"//extensions/common/api:extensions_api",
     "//gpu/command_buffer/client",
+    "//gpu/command_buffer/service",
     "//ipc",
     "//mojo",
     "//net",
@@ -48,6 +49,7 @@ group("root") {
     "//third_party/libwebm",
     "//third_party/libwebp",
     "//third_party/ots",
+    "//third_party/protobuf:protobuf_lite",
     "//third_party/qcms",
     "//third_party/re2",
     "//third_party/smhasher:cityhash",