Files app: Prepare foreground for JS modules

- Add the JS module for icons.html.
- Add the required resources to preprocess_if_exp)

Bug: 1133186
Change-Id: Iac0c6f0c84e14bd1511157677452bc643bf9829a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2636095
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Jeremie Boulic <jboulic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844649}

ui/file_manager/file_manager/foreground/elements/BUILD.gn

@@ -14,8 +14,15 @@ group("elements") {
   visibility += [ "//ui/file_manager/*" ]
   public_deps = [
     "//ui/file_manager/file_manager/foreground/elements:files_icon_button_module",
+    "//ui/file_manager/file_manager/foreground/elements:files_metadata_box_module",
+    "//ui/file_manager/file_manager/foreground/elements:files_metadata_entry_module",
+    "//ui/file_manager/file_manager/foreground/elements:files_quick_view_module",
     "//ui/file_manager/file_manager/foreground/elements:files_ripple_module",
+    "//ui/file_manager/file_manager/foreground/elements:files_safe_media_module",
+    "//ui/file_manager/file_manager/foreground/elements:files_toast_module",
     "//ui/file_manager/file_manager/foreground/elements:files_toggle_ripple_module",
+    "//ui/file_manager/file_manager/foreground/elements:files_tooltip_module",
+    "//ui/file_manager/file_manager/foreground/elements:icons_module",
   ]
 }
 
@@ -432,6 +439,12 @@ js_unittest("files_xf_elements_unittest.m") {
   externs_list = [ "$externs_path/file_manager_private.js" ]
 }
 
+polymer_modulizer("icons") {
+  js_file = "icons.m.js"
+  html_file = "icons.html"
+  html_type = "iron-iconset"
+}
+
 js_library("xf_button") {
   deps = [
     "//ui/webui/resources/cr_elements/cr_button:cr_button",

ui/file_manager/file_manager/foreground/js/deferred_elements.m.js

@@ -14,8 +14,6 @@ import '../elements/files_spinner.m.js';
 import '../elements/files_toast.m.js';
 import '../elements/files_toggle_ripple.m.js';
 import '../elements/files_tooltip.m.js';
-// TODO(lucmult): Figure out if icons.html is needed here.
-// import '../elements/icons.m.js';
 import '../elements/xf_button.m.js';
 import '../elements/xf_circular_progress.m.js';
 import '../elements/xf_display_panel.m.js';