Syntax and coverage checking added to Network Traffic Annotations.

chrome/browser/net/traffic_annotation/BUILD.gn

Index: chrome/browser/net/traffic_annotation/BUILD.gn
diff --git a/chrome/browser/net/traffic_annotation/BUILD.gn b/chrome/browser/net/traffic_annotation/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..d5fa07fe3f1fd74389cf1e81eed471027eb2c27a
--- /dev/null
+++ b/chrome/browser/net/traffic_annotation/BUILD.gn
@@ -0,0 +1,19 @@
+# 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.
+
+static_library("traffic_annotation") {
+  sources = [
+    "network_traffic_annotation_checker.cc",
+    "network_traffic_annotation_checker.h",
+  ]
+
+  deps = [
+    "//base",
+    "//net:traffic_annotation",
+  ]
+
+  if (is_debug || defined(dcheck_always_on)) {
+    deps += [ "//tools/traffic_annotation/auditor:traffic_annotation_auditor" ]
+  }
+}