Brotli compression used on about credits html file.

components/resources/BUILD.gn

Index: components/resources/BUILD.gn
diff --git a/components/resources/BUILD.gn b/components/resources/BUILD.gn
index 3be6fe9ff482057a1235169bce07a6d5e214e3b2..3782edde141c3f3358ec3fa60db2f2da3b11ca73 100644
--- a/components/resources/BUILD.gn
+++ b/components/resources/BUILD.gn
@@ -3,8 +3,10 @@
 # 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") {
@@ -29,11 +31,11 @@ grit("components_resources") {
 
   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",
   ]
 }
 
@@ -57,6 +59,14 @@ grit("components_scaled_resources") {
   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"