WebUI: Replace vulcanize with polymer-bundler

chrome/browser/resources/vulcanize.gni

 # Copyright 2017 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.
 
 template("node") {
   action(target_name) {
     forward_variables_from(invoker, "*")
 
     # Declare dependencies to all involved tools.
     inputs += [
@@ skipping 16 matching lines @@
 
 template("vulcanize") {
   node(target_name) {
     script = "//chrome/browser/resources/vulcanize_gn.py"
 
     inputs = [
       "//chrome/browser/resources/unpack_pak.py",
     ]
 
     # This depfile is generated by vulcanize_gn.py
-    depfile = "${target_gen_dir}/${invoker.html_out_file}.d"
+    depfile = "${target_gen_dir}/${target_name}.d"
 
-    outputs = [
-      "$target_gen_dir/${invoker.html_out_file}",
-      "$target_gen_dir/${invoker.js_out_file}",
-    ]
+    outputs = []
+    foreach(_out, invoker.html_out_files) {
+      outputs += [ "$target_gen_dir/$_out" ]
+    }
+    foreach(_out, invoker.js_out_files) {
+      outputs += [ "$target_gen_dir/$_out" ]
+    }
+
     deps = invoker.deps
 
     # Note that we have to manually pass the sources to our script if the
     # script needs them as inputs.
     args = [
       "--host",
       invoker.host,
-      "--html_in_file",
-      invoker.html_in_file,
-      "--html_out_file",
-      invoker.html_out_file,
-      "--js_out_file",
-      invoker.js_out_file,
       "--input",
       invoker.input,
       "--out_folder",
       rebase_path(target_gen_dir, root_build_dir),
       "--depfile",
       rebase_path(depfile, root_build_dir),
     ]
 
+    args += [ "--html_in_files" ] + invoker.html_in_files
+    args += [ "--html_out_files" ] + invoker.html_out_files
+    args += [ "--js_out_files" ] + invoker.js_out_files
+
     if (defined(invoker.excludes)) {
       args += [ "--exclude" ] + invoker.excludes
     }
 
     if (defined(invoker.insert_in_head)) {
       args += [
         "--insert_in_head",
         invoker.insert_in_head,
       ]
     }
@@ skipping 40 matching lines @@
     deps = invoker.deps
 
     args = [
       "--out_folder",
       rebase_path("$target_gen_dir/${invoker.out_folder}", root_build_dir),
       "--pak_file",
       rebase_path("$target_gen_dir/${invoker.pak_file}", root_build_dir),
     ]
   }
 }