Update from https://crrev.com/306655

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 53 matching lines @@
 #     source = "myfile.grd"
 #     outputs = [
 #       "foo_strings.h",
 #       "foo_strings.pak",
 #     ]
 #
 #     grit_flags = [ "-E", "foo=bar" ]  # Optional extra flags.
 #     # You can also put deps here if the grit source depends on generated
 #     # files.
 #   }
-import ("//build/config/crypto.gni")
-import ("//build/config/features.gni")
-import ("//build/config/ui.gni")
+import("//build/config/crypto.gni")
+import("//build/config/features.gni")
+import("//build/config/ui.gni")
 
 grit_defines = []
 
 # Mac and iOS want Title Case strings.
 use_titlecase_in_grd_files = is_mac || is_ios
 if (use_titlecase_in_grd_files) {
-  grit_defines += [ "-D", "use_titlecase" ]
+  grit_defines += [
+    "-D",
+    "use_titlecase",
+  ]
 }
 
 if (is_chrome_branded) {
   grit_defines += [
-    "-D", "_google_chrome",
-    "-E", "CHROMIUM_BUILD=google_chrome",
+    "-D",
+    "_google_chrome",
+    "-E",
+    "CHROMIUM_BUILD=google_chrome",
   ]
 } else {
   grit_defines += [
-    "-D", "_chromium",
-    "-E", "CHROMIUM_BUILD=chromium",
+    "-D",
+    "_chromium",
+    "-E",
+    "CHROMIUM_BUILD=chromium",
   ]
 }
 
 if (is_chromeos) {
   grit_defines += [
-    "-D", "chromeos",
-    "-D", "scale_factors=2x"
+    "-D",
+    "chromeos",
+    "-D",
+    "scale_factors=2x",
   ]
 }
 
 if (is_desktop_linux) {
-  grit_defines += [ "-D", "desktop_linux" ]
+  grit_defines += [
+    "-D",
+    "desktop_linux",
+  ]
 }
 
 if (toolkit_views) {
-  grit_defines += [ "-D", "toolkit_views" ]
+  grit_defines += [
+    "-D",
+    "toolkit_views",
+  ]
 }
 
 if (use_aura) {
-  grit_defines += [ "-D", "use_aura" ]
+  grit_defines += [
+    "-D",
+    "use_aura",
+  ]
 }
 
 if (use_ash) {
-  grit_defines += [ "-D", "use_ash" ]
+  grit_defines += [
+    "-D",
+    "use_ash",
+  ]
 }
 
 if (use_nss_certs) {
-  grit_defines += [ "-D", "use_nss" ]
+  grit_defines += [
+    "-D",
+    "use_nss",
+  ]
 }
 
 if (use_ozone) {
-  grit_defines += [ "-D", "use_ozone" ]
+  grit_defines += [
+    "-D",
+    "use_ozone",
+  ]
 }
 
 if (enable_image_loader_extension) {
-  grit_defines += [ "-D", "image_loader_extension" ]
+  grit_defines += [
+    "-D",
+    "image_loader_extension",
+  ]
 }
 
 if (enable_remoting) {
-  grit_defines += [ "-D", "remoting" ]
+  grit_defines += [
+    "-D",
+    "remoting",
+  ]
 }
 
 if (is_android) {
   grit_defines += [
-    "-t", "android",
-    "-E", "ANDROID_JAVA_TAGGED_ONLY=true",
+    "-t",
+    "android",
+    "-E",
+    "ANDROID_JAVA_TAGGED_ONLY=true",
   ]
 }
 
 if (is_mac || is_ios) {
-  grit_defines += [ "-D", "scale_factors=2x" ]
+  grit_defines += [
+    "-D",
+    "scale_factors=2x",
+  ]
 }
 
 if (is_ios) {
   grit_defines += [
-    "-t", "ios",
+    "-t",
+    "ios",
+
     # iOS uses a whitelist to filter resources.
-    "-w", rebase_path("//build/ios/grit_whitelist.txt", root_build_dir),
+    "-w",
+    rebase_path("//build/ios/grit_whitelist.txt", root_build_dir),
   ]
 }
 
 if (enable_extensions) {
-  grit_defines += [ "-D", "enable_extensions" ]
+  grit_defines += [
+    "-D",
+    "enable_extensions",
+  ]
 }
 if (enable_plugins) {
-  grit_defines += [ "-D", "enable_plugins" ]
+  grit_defines += [
+    "-D",
+    "enable_plugins",
+  ]
 }
 if (enable_basic_printing || enable_print_preview) {
-  grit_defines += [ "-D", "enable_printing" ]
+  grit_defines += [
+    "-D",
+    "enable_printing",
+  ]
   if (enable_print_preview) {
-    grit_defines += [ "-D", "enable_print_preview" ]
+    grit_defines += [
+      "-D",
+      "enable_print_preview",
+    ]
   }
 }
 if (enable_themes) {
-  grit_defines += [ "-D", "enable_themes" ]
+  grit_defines += [
+    "-D",
+    "enable_themes",
+  ]
 }
 if (enable_app_list) {
-  grit_defines += [ "-D", "enable_app_list" ]
+  grit_defines += [
+    "-D",
+    "enable_app_list",
+  ]
 }
 if (enable_settings_app) {
-  grit_defines += [ "-D", "enable_settings_app" ]
+  grit_defines += [
+    "-D",
+    "enable_settings_app",
+  ]
 }
 if (enable_google_now) {
-  grit_defines += [ "-D", "enable_google_now" ]
-}
+  grit_defines += [
+    "-D",
+    "enable_google_now",
+  ]
+}
+
 # Note: use_concatenated_impulse_responses is omitted. It is never used and
 # should probably be removed from GYP build.
 if (enable_webrtc) {
-  grit_defines += [ "-D", "enable_webrtc" ]
-}
-# Note: enable_hangout_services_extension is omitted. It is never set in the
-# GYP build. Need to figure out what it's for.
+  grit_defines += [
+    "-D",
+    "enable_webrtc",
+  ]
+}
+if (enable_hangout_services_extension) {
+  grit_defines += [
+    "-D",
+    "enable_hangout_services_extension",
+  ]
+}
 if (enable_task_manager) {
-  grit_defines += [ "-D", "enable_task_manager" ]
+  grit_defines += [
+    "-D",
+    "enable_task_manager",
+  ]
 }
 if (enable_notifications) {
-  grit_defines += [ "-D", "enable_notifications" ]
+  grit_defines += [
+    "-D",
+    "enable_notifications",
+  ]
 }
 if (enable_wifi_bootstrapping) {
-  grit_defines += [ "-D", "enable_wifi_bootstrapping" ]
+  grit_defines += [
+    "-D",
+    "enable_wifi_bootstrapping",
+  ]
 }
 if (enable_service_discovery) {
-  grit_defines += [ "-D", "enable_service_discovery" ]
+  grit_defines += [
+    "-D",
+    "enable_service_discovery",
+  ]
 }
 
 grit_resource_id_file = "//tools/gritsettings/resource_ids"
 grit_info_script = "//tools/grit/grit_info.py"
 
 template("grit") {
   assert(defined(invoker.source),
          "\"source\" must be defined for the grit template $target_name")
 
   if (defined(invoker.resource_ids)) {
@@ skipping 33 matching lines @@
   assert_files_flags = []
 
   # We want to make sure the declared outputs actually match what Grit is
   # writing. We write the list to a file (some of the output lists are long
   # enough to not fit on a Windows command line) and ask Grit to verify those
   # are the actual outputs at runtime.
   asserted_list_file =
       "$target_out_dir/${grit_output_name}_expected_outputs.txt"
   write_file(asserted_list_file,
              rebase_path(invoker.outputs, root_build_dir, output_dir))
-  assert_files_flags += [
-    "--assert-file-list=" + rebase_path(asserted_list_file, root_build_dir),
-  ]
-  grit_outputs = get_path_info(
-      rebase_path(invoker.outputs, ".", output_dir),
-      "abspath")
+  assert_files_flags += [ "--assert-file-list=" +
+                          rebase_path(asserted_list_file, root_build_dir) ]
+  grit_outputs =
+      get_path_info(rebase_path(invoker.outputs, ".", output_dir), "abspath")
 
   # The config and the action below get this visibility son only the generated
   # source set can depend on them. The variable "target_name" will get
   # overwritten inside the inner classes so we need to compute it here.
   target_visibility = [ ":$target_name" ]
 
   # The current grit setup makes an file in $output_dir/grit/foo.h that
   # the source code expects to include via "grit/foo.h". It would be nice to
   # change this to including absolute paths relative to the root gen directory
   # (like "mycomponent/foo.h"). This config sets up the include path.
   grit_config = target_name + "_grit_config"
   config(grit_config) {
     if (!defined(invoker.use_qualified_include) ||
         !invoker.use_qualified_include) {
       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
     outputs = grit_outputs
     depfile = "$output_dir/${grit_output_name}.d"
 
     args = [
-      "-i", source_path, "build",
+      "-i",
+      source_path,
+      "build",
     ]
     if (resource_ids != "") {
-      args += [ "-f", resource_ids ]
+      args += [
+        "-f",
+        resource_ids,
+      ]
     }
     args += [
-      "-o", rebased_output_dir,
-      "--depdir", ".",
-      "--depfile", rebase_path(depfile, root_build_dir),
-    ] + grit_defines
+              "-o",
+              rebased_output_dir,
+              "--depdir",
+              ".",
+              "--depfile",
+              rebase_path(depfile, root_build_dir),
+            ] + grit_defines
 
     # Add extra defines with -D flags.
     if (defined(invoker.defines)) {
-      foreach (i, invoker.defines) {
-        args += [ "-D", i ]
+      foreach(i, invoker.defines) {
+        args += [
+          "-D",
+          i,
+        ]
       }
     }
 
     args += grit_flags + assert_files_flags
 
     if (defined(invoker.visibility)) {
       # This needs to include both what the invoker specified (since they
       # probably include generated headers from this target), as well as the
       # generated source set (since there's no guarantee that the visibility
       # specified by the invoker includes our target).
       #
       # Only define visibility at all if the invoker specified it. Otherwise,
       # we want to keep the public "no visibility specified" default.
       visibility = target_visibility + invoker.visibility
     }
 
-    deps = [ "//tools/grit:grit_sources" ]
+    deps = [
+      "//tools/grit:grit_sources",
+    ]
     if (defined(invoker.deps)) {
       deps += invoker.deps
     }
   }
 
   # This is the thing that people actually link with, it must be named the
   # same as the argument the template was invoked with.
   source_set(target_name) {
     # Since we generate a file, we need to be run before the targets that
     # depend on us.
     sources = grit_outputs
 
     # Deps set on the template invocation will go on the grit script running
     # target rather than this library.
-    deps = [ ":$grit_custom_target" ]
+    deps = [
+      ":$grit_custom_target",
+    ]
     public_configs = [ ":$grit_config" ]
 
     if (defined(invoker.public_configs)) {
       public_configs += invoker.public_configs
     }
 
     if (defined(invoker.visibility)) {
       visibility = invoker.visibility
     }
     output_name = grit_output_name
   }
 }