Add grit resource ID file to GN grit script inputs.

Grit's execution depends on the resource ID file, but this was not listed as a dependency in grit targets. This means that changing the resource ID file wouldn't re-run grit.

Review URL: https://codereview.chromium.org/1038213002

Cr-Commit-Position: refs/heads/master@{#322531}

build/secondary/tools/grit/grit_rule.gni

@@ -299,11 +299,14 @@ template("grit") {
   assert(defined(invoker.source),
          "\"source\" must be defined for the grit template $target_name")
 
+  grit_inputs = [ invoker.source ]
+
   if (defined(invoker.resource_ids)) {
     resource_ids = invoker.resource_ids
   } else {
     resource_ids = grit_resource_id_file
   }
+  grit_inputs += [ resource_ids ]  # Script depends on ID file.
 
   if (defined(invoker.output_dir)) {
     output_dir = invoker.output_dir
@@ -331,8 +334,6 @@ template("grit") {
     grit_flags = []  # These are optional so default to empty list.
   }
 
-  grit_inputs = [ invoker.source ]
-
   assert_files_flags = []
 
   # We want to make sure the declared outputs actually match what Grit is