Disable preload for module scripts

third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009 Torch Mobile, Inc. http://www.torchmobile.com/
  * Copyright (C) 2010 Google Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 523 matching lines @@
       return ShouldPreloadLink(type);
     if (Match(tag_impl_, inputTag) && !input_is_image_)
       return false;
     if (Match(tag_impl_, scriptTag)) {
       ScriptType script_type = ScriptType::kClassic;
       if (!ScriptLoader::IsValidScriptTypeAndLanguage(
               type_attribute_value_, language_attribute_value_,
               ScriptLoader::kAllowLegacyTypeInTypeAttribute, script_type)) {
         return false;
       }
+      // TODO(kouhei): Enable preload for module scripts, with correct

[Kunihiko Sakamoto, 2017/05/10 10:07:12]

Kouhei, would you mind having your name here? :)

+      // credentials mode.
+      if (type_attribute_value_ == "module")
+        return false;
       if (ScriptLoader::BlockForNoModule(script_type,
                                          nomodule_attribute_value_)) {
         return false;
       }
     }
     return true;
   }
 
   void SetCrossOrigin(const String& cors_setting) {
     cross_origin_ = GetCrossOriginAttributeValue(cors_setting);
@@ skipping 408 matching lines @@
   default_viewport_min_width = document->ViewportDefaultMinWidth();
   viewport_meta_zero_values_quirk =
       document->GetSettings() &&
       document->GetSettings()->GetViewportMetaZeroValuesQuirk();
   viewport_meta_enabled = document->GetSettings() &&
                           document->GetSettings()->GetViewportMetaEnabled();
   referrer_policy = document->GetReferrerPolicy();
 }
 
 }  // namespace blink