Settings: Add settings_resources_v3.grdp.

This is in preparation of migrating to Polymer 3.

Bug: 1026426
Change-Id: Ia950fecef1b3a13af65d5e1505d2cd37d1e1b5cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2024150Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735702}

chrome/browser/resources/BUILD.gn

@@ -202,6 +202,11 @@ if (!is_android) {
   }
 
   grit("settings_resources") {
+    grit_flags = [
+      "-E",
+      "root_gen_dir=" + rebase_path(root_gen_dir, root_build_dir),
+    ]
+
     if (optimize_webui) {
       source = "settings/settings_resources_vulcanized.grd"
 
@@ -209,10 +214,6 @@ if (!is_android) {
       source_is_generated = true
 
       deps = [ "//chrome/browser/resources/settings:build" ]
-      grit_flags = [
-        "-E",
-        "root_gen_dir=" + rebase_path(root_gen_dir, root_build_dir),
-      ]
     } else {
       source = "settings/settings_resources.grd"
     }

chrome/browser/resources/settings/settings_resources.grd

@@ -11,6 +11,9 @@
     <output filename="settings_resources.pak" type="data_package" />
   </outputs>
   <release seq="1">
+    <includes>
+      <part file="settings_resources_v3.grdp" />
+    </includes>
     <structures>
       <structure name="IDR_SETTINGS_A11Y_PAGE_JS"
                  file="a11y_page/a11y_page.js"

chrome/browser/resources/settings/settings_resources_v3.grdp

+<?xml version="1.0" encoding="utf-8"?>
+<grit-part>
+  <!--TODO(crbug.com/1026426): Add generated Polymer 3 files here-->
+</grit-part>

tools/gritsettings/resource_ids.spec

@@ -174,6 +174,7 @@
     "includes": [1780],
   },
   "chrome/browser/resources/settings/settings_resources.grd": {
+    "includes": [1790],
     "structures": [1800],
   },
   "chrome/browser/resources/tab_strip/tab_strip_resources.grd": {