Compress IDR_SUPERVISED_USER_BLOCK_INTERSTITIAL_HTML

Noticed during milestone binary size review.

Bug: 982762
Change-Id: If14512c734f726ad6bc74feb539d954ca177eb21
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1803394
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697603}

chrome/browser/BUILD.gn

@@ -5304,6 +5304,9 @@ grit("resources") {
   # The .grd contains references to generated files.
   source_is_generated = true
 
+  # Allow compress="brotli". Used in supervised_user_error_page_resources.grdp.
+  use_brotli = enable_supervised_users
+
   defines = chrome_grit_defines
   if (enable_hangout_services_extension) {
     defines += [ "enable_hangout_services_extension" ]

chrome/browser/resources/supervised_user_error_page_resources.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <grit-part>
-  <include name="IDR_SUPERVISED_USER_BLOCK_INTERSTITIAL_HTML" file="supervised_user/supervised_user_error_page/resources/supervised_user_block_interstitial.html" flattenhtml="true" type="BINDATA" />
+  <include name="IDR_SUPERVISED_USER_BLOCK_INTERSTITIAL_HTML" file="supervised_user/supervised_user_error_page/resources/supervised_user_block_interstitial.html" flattenhtml="true" type="BINDATA" compress="brotli" />
 </grit-part>

chrome/browser/supervised_user/supervised_user_error_page/supervised_user_error_page.cc

@@ -172,9 +172,8 @@ std::string BuildHtml(bool allow_access_requests,
   strings.SetString("requestFailedMessage", request_failed_message);
   webui::SetLoadTimeDataDefaults(app_locale, &strings);
   std::string html =
-      ui::ResourceBundle::GetSharedInstance()
-          .GetRawDataResource(IDR_SUPERVISED_USER_BLOCK_INTERSTITIAL_HTML)
-          .as_string();
+      ui::ResourceBundle::GetSharedInstance().DecompressDataResource(
+          IDR_SUPERVISED_USER_BLOCK_INTERSTITIAL_HTML);
   webui::AppendWebUiCssTextDefaults(&html);
   std::string error_html = webui::GetI18nTemplateHtml(html, &strings);
   return error_html;