Update from https://crrev.com/307330

build/secondary/tools/grit/grit_rule.gni

 # Copyright 2014 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.
 
 # Instantiate grit. This will produce a script target to run grit, and a
 # static library that compiles the .cc files.
 #
 # Parameters
 #
 #   source (required)
@@ skipping 363 matching lines @@
         resource_ids,
       ]
     }
     args += [
               "-o",
               rebased_output_dir,
               "--depdir",
               ".",
               "--depfile",
               rebase_path(depfile, root_build_dir),
+              "--write-only-new=1",
             ] + grit_defines
 
     # Add extra defines with -D flags.
     if (defined(invoker.defines)) {
       foreach(i, invoker.defines) {
         args += [
           "-D",
           i,
         ]
       }
@@ skipping 37 matching lines @@
     if (defined(invoker.public_configs)) {
       public_configs += invoker.public_configs
     }
 
     if (defined(invoker.visibility)) {
       visibility = invoker.visibility
     }
     output_name = grit_output_name
   }
 }