MD Downloads: gzip vulcanized resources via compress="gzip"

chrome/browser/ui/webui/md_downloads/md_downloads_ui.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/ui/webui/md_downloads/md_downloads_ui.h"
 
 #include "base/memory/ref_counted_memory.h"
 #include "base/memory/singleton.h"
 #include "base/strings/string_piece.h"
 #include "base/threading/thread.h"
@@ skipping 87 matching lines @@
   source->AddResourcePath("1x/incognito_marker.png",
                           IDR_MD_DOWNLOADS_1X_INCOGNITO_MARKER_PNG);
   source->AddResourcePath("2x/incognito_marker.png",
                           IDR_MD_DOWNLOADS_2X_INCOGNITO_MARKER_PNG);
   source->AddResourcePath("1x/no_downloads.png",
                           IDR_MD_DOWNLOADS_1X_NO_DOWNLOADS_PNG);
   source->AddResourcePath("2x/no_downloads.png",
                           IDR_MD_DOWNLOADS_2X_NO_DOWNLOADS_PNG);
 
 #if BUILDFLAG(USE_VULCANIZE)
+  std::unordered_set<std::string> exclude_from_gzip;
+  exclude_from_gzip.insert("1x/incognito_marker.png");
+  exclude_from_gzip.insert("2x/incognito_marker.png");
+  exclude_from_gzip.insert("1x/no_downloads.png");
+  exclude_from_gzip.insert("2x/no_downloads.png");
+  source->UseGzip(exclude_from_gzip);
+
   source->AddResourcePath("crisper.js", IDR_MD_DOWNLOADS_CRISPER_JS);
   source->SetDefaultResource(IDR_MD_DOWNLOADS_VULCANIZED_HTML);
 #else
   source->AddResourcePath("action_service.html",
                           IDR_MD_DOWNLOADS_ACTION_SERVICE_HTML);
   source->AddResourcePath("action_service.js",
                           IDR_MD_DOWNLOADS_ACTION_SERVICE_JS);
   source->AddResourcePath("constants.html", IDR_MD_DOWNLOADS_CONSTANTS_HTML);
   source->AddResourcePath("constants.js", IDR_MD_DOWNLOADS_CONSTANTS_JS);
   source->AddResourcePath("downloads.js", IDR_MD_DOWNLOADS_DOWNLOADS_JS);
@@ skipping 35 matching lines @@
   ThemeSource* theme = new ThemeSource(profile);
   content::URLDataSource::Add(profile, theme);
 }
 
 // static
 base::RefCountedMemory* MdDownloadsUI::GetFaviconResourceBytes(
     ui::ScaleFactor scale_factor) {
   return ResourceBundle::GetSharedInstance().
       LoadDataResourceBytesForScale(IDR_DOWNLOADS_FAVICON, scale_factor);
 }