Port chromevox build to GN.

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)
 #       Path to .grd file.
 #
 #   outputs (required)
-#       List of outputs from grit, relative to the target_gen_dir. If supplied,
-#       a call to Grit to compute the outputs can be skipped which will make
-#       GN run faster. Grit will verify at build time that this list is correct
-#       and will fail if there is a mismatch between the outputs specified by
-#       the .grd file and the outputs list here.
+#       List of outputs from grit, relative to the target_gen_dir. Grit will
+#       verify at build time that this list is correct and will fail if there
+#       is a mismatch between the outputs specified by the .grd file and the
+#       outputs list here.
 #
 #       To get this list, you can look in the .grd file for
 #       <output filename="..." and put those filename here. The base directory
 #       of the list in Grit and the output list specified in the GN grit target
 #       are the same (the target_gen_dir) so you can generally copy the names
 #       exactly.
 #
 #       To get the list of outputs programatically, run:
 #           python tools/grit/grit_info.py --outputs . path/to/your.grd
 #       And strip the leading "./" from the output files.
@@ skipping 14 matching lines @@
 #       want to specify output_name if the target name is not particularly
 #       unique, since this can cause files from multiple grit targets to
 #       overwrite each other.
 #
 #   output_name (optiona)
 #       Provide an alternate base name for the generated files, like the .d
 #       files. Normally these are based on the target name and go in the
 #       output_dir, but if multiple targets with the same name end up in
 #       the same output_dir, they can collide.
 #
+#   depfile_dir (optional)
+#       If set, used to store the depfile and corresponding stamp file.
+#       Defaults to output_dir
+#
 #   use_qualified_include (optional)
 #       If set, output_dir is not added to include_dirs.
 #
 #   configs (optional)
 #       List of additional configs to be applied to the generated target.
 #   deps  (optional)
 #   inputs  (optional)
 #       List of additional files, required for grit to process source file.
 #   visibility  (optional)
 #       Normal meaning.
@@ skipping 261 matching lines @@
   } else {
     output_dir = target_gen_dir
   }
 
   if (defined(invoker.output_name)) {
     grit_output_name = invoker.output_name
   } else {
     grit_output_name = target_name
   }
 
+  if (defined(invoker.depfile_dir)) {
+    depfile_dir = invoker.depfile_dir
+  } else {
+    depfile_dir = output_dir
+  }
+
   # These are all passed as arguments to the script so have to be relative to
   # the build directory.
   if (resource_ids != "") {
     resource_ids = rebase_path(resource_ids, root_build_dir)
   }
   rebased_output_dir = rebase_path(output_dir, root_build_dir)
   source_path = rebase_path(invoker.source, root_build_dir)
 
   if (defined(invoker.grit_flags)) {
     grit_flags = invoker.grit_flags
@@ skipping 32 matching lines @@
       include_dirs = [ output_dir ]
     }
     visibility = target_visibility
   }
 
   grit_custom_target = target_name + "_grit"
   action(grit_custom_target) {
     script = "//tools/grit/grit.py"
     inputs = grit_inputs
 
-    depfile = "$output_dir/${grit_output_name}_stamp.d"
+    depfile = "$depfile_dir/${grit_output_name}_stamp.d"
     outputs = [ "${depfile}.stamp" ] + grit_outputs
 
     args = [
       "-i",
       source_path,
       "build",
     ]
     if (resource_ids != "") {
       args += [
         "-f",
@@ skipping 68 matching lines @@
     if (defined(invoker.configs)) {
       configs += invoker.configs
     }
 
     if (defined(invoker.visibility)) {
       visibility = invoker.visibility
     }
     output_name = grit_output_name
   }
 }