[CrOS settings] Add os_settings_resources_v3.grdp file

This cl adds a new os_settings_resources_v3.grdp file, in preparation of migrating
to Polymer 3.

Bug: 1045266
Change-Id: I55103ba896586f7322498449e2c5b2eed7f70a97
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2167803
Commit-Queue: Nnamdi Theodore Johnson-kanu <tjohnsonkanu@google.com>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#763523}

chrome/browser/resources/BUILD.gn

@@ -279,6 +279,10 @@ if (!is_android) {
 
 if (is_chromeos) {
   grit("os_settings_resources") {
+    grit_flags = [
+      "-E",
+      "root_gen_dir=" + rebase_path(root_gen_dir, root_build_dir),
+    ]
     deps = [
       "//chrome/browser/ui/webui/app_management:mojo_bindings_js",
       "//chrome/browser/ui/webui/settings/chromeos/search:mojo_bindings_js",
@@ -295,11 +299,6 @@ if (is_chromeos) {
           [ "//chrome/browser/resources/settings/chromeos:polymer3_elements" ]
     }
 
-    grit_flags = [
-      "-E",
-      "root_gen_dir=" + rebase_path(root_gen_dir, root_build_dir),
-    ]
-
     defines = chrome_grit_defines
     outputs = [
       "grit/os_settings_resources.h",

chrome/browser/resources/settings/chromeos/os_settings_resources_v3.grdp

+<?xml version="1.0" encoding="utf-8"?>
+<grit-part>
+  <!--TODO(crbug.com/1045266): Add Polymer 3 files here-->
+</grit-part>
\ No newline at end of file

chrome/browser/resources/settings/os_settings_resources.grd

@@ -12,6 +12,7 @@
   </outputs>
   <release seq="1">
     <includes>
+      <part file="chromeos/os_settings_resources_v3.grdp" />
       <!-- App Management -->
       <include name="IDR_OS_SETTINGS_APP_MANAGEMENT_BITMAP_MOJO_LITE_JS"
                file="${root_gen_dir}\skia\public\mojom\bitmap.mojom-lite.js"