Brotli compression used on about credits html file.

components/resources/BUILD.gn

 # Copyright 2014 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.
 
 import("//tools/grit/grit_rule.gni")
+import("//third_party/brotli/brotli.gni")
 
 about_credits_file = "$target_gen_dir/about_credits.html"
+about_credits_file_bro = "$target_gen_dir/about_credits.bro"
 
 # GYP version: components/components_resources.gyp:components_resources
 group("resources") {
   public_deps = [
     ":components_resources",
     ":components_scaled_resources",
   ]
 }
 
 # GYP version: components/components_resources.gyp
 #              (generate_components_resources action)
 grit("components_resources") {
   source = "components_resources.grd"
 
   # TODO(hashimoto): Remove this line.
   output_name = "components_resources_new"
   outputs = [
     "grit/components_resources.h",
     "components_resources.pak",
   ]
   output_dir = "$root_gen_dir/components"
 
   grit_flags = [
     "-E",
-    "about_credits_file=" + rebase_path(about_credits_file, root_build_dir),
+    "about_credits_file=" + rebase_path(about_credits_file_bro, root_build_dir),
   ]
 
   deps = [
-    ":about_credits",
+    ":compressed_about_credits",
   ]
 }
 
 # GYP version: components/components_resources.gyp
 #              (generate_scaled_components_resources action)
 grit("components_scaled_resources") {
   source = "components_scaled_resources.grd"
 
   # TODO(hashimoto): Remove this line.
   output_name = "components_scaled_resources_new"
   outputs = [
     "grit/components_scaled_resources.h",
     "grit/components_scaled_resources_map.cc",
     "grit/components_scaled_resources_map.h",
     "components_resources_100_percent.pak",
     "components_resources_200_percent.pak",
     "components_resources_300_percent.pak",
     "components_resources_material_100_percent.pak",
     "components_resources_material_200_percent.pak",
   ]
   output_dir = "$root_gen_dir/components"
 }
 
+compress_file_brotli("compressed_about_credits") {
+  input_file = about_credits_file
+  output_file = about_credits_file_bro
+  deps = [
+    ":about_credits",
+  ]
+}
+
 # GYP version: components/components_resources.gyp:about_credits
 action("about_credits") {
   script = "//tools/licenses.py"
 
   inputs = [
     # This is not a complete list. TODO(phajdan.jr, dbeam): licenses.py needs to
     # generate a .d file with all the licenses/credits that about:credits uses.
     # Then about:credits will automatically rebuild when one of them changes.
     # See: depfile in gn's documentation (gn help depfile).
     "../about_ui/resources/about_credits.tmpl",
     "../about_ui/resources/about_credits_entry.tmpl",
   ]
 
   outputs = [
     about_credits_file,
   ]
 
   args = [
     "--target-os=$target_os",
     "credits",
     rebase_path(about_credits_file, root_build_dir),
   ]
 }