MD Bookmarks: Vulcanize page to reduce load time

chrome/browser/resources/md_bookmarks/BUILD.gn

+import("../vulcanize.gni")
+
+vulcanized_unbuilt = "vulcanized.unbuilt.html"
+
+vulcanize("vulcanize") {
+  host = "bookmarks"
+  html_in_file = "bookmarks.html"
+  html_out_file = vulcanized_unbuilt
+
+  input = rebase_path(".", root_build_dir)
+  js_out_file = "crisper.js"
+
+  deps = []
+}
+
+polymer_css_build("build") {
+  input_files = [ vulcanized_unbuilt ]
+  output_files = [ "vulcanized.html" ]
+  deps = [
+    ":vulcanize",

[calamity, 2017/05/29 07:26:51]

optional nit: remove comma.

[tsergeant, 2017/05/30 00:35:51]

This comma is placed there by `git cl format`, for whatever reason

+  ]
+}