webui: minimize webui flicker.

chrome/browser/ui/webui/options/options_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/options/options_ui.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 161 matching lines @@
   if (path == kLocalizedStringsFile) {
     // Return dynamically-generated strings from memory.
     std::string strings_js;
     webui::AppendJsonJS(localized_strings_.get(), &strings_js);
     response_bytes = base::RefCountedString::TakeString(&strings_js);
   } else if (path == kOptionsBundleJsFile) {
     // Return (and cache) the options javascript code.
     response_bytes = ui::ResourceBundle::GetSharedInstance().
         LoadDataResourceBytes(IDR_OPTIONS_BUNDLE_JS);
   } else {
-    // Return (and cache) the main options html page as the default.
-    response_bytes = ui::ResourceBundle::GetSharedInstance().
-        LoadDataResourceBytes(IDR_OPTIONS_HTML);
+    // Return the main options html page as the default.
+    std::string html_page = webui::ReplaceFontFamilyAndSize(
+        ui::ResourceBundle::GetSharedInstance().
+            GetRawDataResource(IDR_OPTIONS_HTML).as_string());

[Dan Beam, 2014/11/22 04:27:12]

this probably makes more copies than I'd like, but just let me know if you like
this approach

+    response_bytes = base::RefCountedString::TakeString(&html_page);
   }
 
   callback.Run(response_bytes.get());
 }
 
 std::string OptionsUIHTMLSource::GetMimeType(const std::string& path) const {
   if (path == kLocalizedStringsFile || path == kOptionsBundleJsFile)
     return "application/javascript";
 
   return "text/html";
@@ skipping 287 matching lines @@
   // Add only if handler's service is enabled.
   if (handler->IsEnabled()) {
     // Add handler to the list and also pass the ownership.
     web_ui()->AddMessageHandler(handler.release());
     handler_raw->GetLocalizedValues(localized_strings);
     handlers_.push_back(handler_raw);
   }
 }
 
 }  // namespace options