Syntax and coverage checking added to Network Traffic Annotations.

tools/traffic_annotation/auditor/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//third_party/protobuf/proto_library.gni")
 
 # Works only on desktop platforms.
 assert(is_win || is_linux || is_mac)
 
 proto_library("chrome_settings_full_runtime") {
   proto_out_dir = "/tools/traffic_annotation"
 
   cc_include = "components/policy/proto/policy_proto_export.h"
 
   sources = [
     "$root_gen_dir" +
         "/components/policy/proto/cloud_policy_full_runtime.proto",
     "$root_gen_dir" +
         "/components/policy/proto/chrome_settings_full_runtime.proto",
   ]
 
-  use_protobuf_full = true
+  # use_protobuf_full = true
 
   deps = [
     "//components/policy:full_runtime_code_generate",
-    "//third_party/protobuf:protobuf_full",
+    "//third_party/protobuf:protobuf_lite",
   ]
 }
 
 proto_library("traffic_annotation") {
   sources = [
     "../traffic_annotation.proto",
   ]
 
   import_dirs = [ "$root_gen_dir" + "/components/policy/proto" ]
 
   deps = [
     ":chrome_settings_full_runtime",
   ]
 
-  use_protobuf_full = true
+  # use_protobuf_full = true
 }
 
 group("traffic_annotation_auditor") {
   deps = [
     ":traffic_annotation",
-    "//third_party/protobuf:protobuf_full",
+    "//third_party/protobuf:protobuf_lite",
   ]
 }