Add chrome perf tests and sniffer to GN build.

remoting/resources/BUILD.gn

Index: remoting/resources/BUILD.gn
diff --git a/remoting/resources/BUILD.gn b/remoting/resources/BUILD.gn
index 085ac3f14b6786b1d955f7617756eb7d314dac7b..4caecf9ff516210bdb2ec3dd6b3ab9440d0b984d 100644
--- a/remoting/resources/BUILD.gn
+++ b/remoting/resources/BUILD.gn
@@ -162,8 +162,16 @@ grit("strings") {
   outputs += process_file_template(
       remoting_locales,
       [ "remoting/resources/{{source_name_part}}.pak" ])
+
+  messages_locales = remoting_locales_with_underscores
+  if (!is_chromeos) {
+    # The messages output includes a separate one for en-US that the pak ones
+    # don't have. We don't need to do this on ChromeOS since en_US is in the
+    # locales list be default there.
+    messages_locales += [ "en_US" ]
+  }
   outputs += process_file_template(
-      remoting_locales_with_underscores,
+      messages_locales,
       [ "remoting/webapp/_locales/{{source_name_part}}/messages.json" ])
 }