[MD WebUI] Polymer-CSS-Build across all bundles.

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("vulcanize") {
+template("node") {
   action(target_name) {
-    script = "//chrome/browser/resources/vulcanize_gn.py"
+    forward_variables_from(invoker, "*")
 
     # Declare dependencies to all involved tools.
-    inputs = [
-      "//chrome/browser/resources/unpack_pak.py",
+    inputs += [
       "//third_party/node/node.py",
       "//third_party/node/node_modules.py",
       "//third_party/node/node_modules.tar.gz.sha1",
     ]
 
     if (is_linux) {
       inputs += [ "//third_party/node/linux/node-linux-x64.tar.gz.sha1" ]
     }
     if (is_win) {
       inputs += [ "//third_party/node/win/node.exe.sha1" ]
     }
     if (is_mac) {
       inputs += [ "//third_party/node/mac/node-darwin-x64.tar.gz.sha1" ]
     }
+  }
+}
 
+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 = "${target_gen_dir}/${target_name}.d"
 
     outputs = [
       "$target_gen_dir/${invoker.html_out_file}",
       "$target_gen_dir/${invoker.js_out_file}",
     ]
     deps = invoker.deps
 
     # Note that we have to manually pass the sources to our script if the
     # script needs them as inputs.
@@ skipping 19 matching lines @@
     }
 
     if (defined(invoker.insert_in_head)) {
       args += [
         "--insert_in_head",
         invoker.insert_in_head,
       ]
     }
   }
 }
+
+template("css_build") {
+  node(target_name) {
+    script = "//chrome/browser/resources/css_build_gn.py"
+
+    inputs = []
+
+    foreach(_input, invoker.input_files) {
+      inputs += [ "$target_gen_dir/$_input" ]
+    }
+
+    outputs = []
+    foreach(_output, invoker.output_files) {
+      outputs += [ "$target_gen_dir/$_output" ]
+    }
+
+    deps = invoker.deps
+
+    args = [
+             "--out_folder",
+             rebase_path(target_gen_dir, root_build_dir),
+             "--input_files",
+           ] + invoker.input_files + [ "--output_files" ] + invoker.output_files
+  }
+}