Make mojo/services pass in "gn check"

mojo/public/tools/bindings/mojom.gni

Index: mojo/public/tools/bindings/mojom.gni
diff --git a/mojo/public/tools/bindings/mojom.gni b/mojo/public/tools/bindings/mojom.gni
index d1637395e5b193f3ec6d6498a29067d39f49e5d3..74e6153a9c093d9dfeb4b32d402afff755364850 100644
--- a/mojo/public/tools/bindings/mojom.gni
+++ b/mojo/public/tools/bindings/mojom.gni
@@ -12,10 +12,8 @@
 #       List of source .mojom files to compile.
 #
 #   deps (optional)
-#
+#   public_deps (optional)
 #   visibility (optional)
-#       Normal meaning. However, this must be a list (normal visibility
-#       allows a single string).
 template("mojom") {
   assert(defined(invoker.sources),
          "\"sources\" must be defined for the $target_name template.")
@@ -85,7 +83,7 @@ template("mojom") {
     target_visibility = [ ":$target_name" ]
   }
 
-  generator_target_name = target_name + "_generator"
+  generator_target_name = target_name + "__generator"
   action_foreach(generator_target_name) {
     if (defined(invoker.visibility)) {
       visibility = target_visibility + invoker.visibility
@@ -118,5 +116,8 @@ template("mojom") {
     if (defined(invoker.deps)) {
       deps += invoker.deps
     }
+    if (defined(invoker.public_deps)) {
+      public_deps = invoker.public_deps
+    }
   }
 }