Making the warning message more clear and adding an error message when the script actually gets blo…

third_party/WebKit/Source/core/loader/FrameFetchContext.cpp

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 73 matching lines @@
 #include <algorithm>
 #include <memory>
 
 namespace blink {
 
 namespace {
 
 void emitWarningForDocWriteScripts(const String& url, Document& document) {
   String message =
       "A Parser-blocking, cross site (i.e. different eTLD+1) script, " + url +
-      ", is invoked via document.write. This may be blocked by "
-      "the browser if the device has poor network connectivity. "
+      ", is invoked via document.write. This MAY be blocked by "
+      "the browser in this or a future page load due to poor network "
+      "connectivity. If blocked in this page load, it will be confirmed in a "
+      "subsequent console message."
       "See https://www.chromestatus.com/feature/5718547946799104 "
       "for more details.";
   document.addConsoleMessage(
       ConsoleMessage::create(JSMessageSource, WarningMessageLevel, message));
   WTFLogAlways("%s", message.utf8().data());
 }
 
 bool isConnectionEffectively2G(WebEffectiveConnectionType effectiveType) {
   switch (effectiveType) {
     case WebEffectiveConnectionType::TypeSlow2G:
@@ skipping 968 matching lines @@
                                                     response);
 }
 
 DEFINE_TRACE(FrameFetchContext) {
   visitor->trace(m_document);
   visitor->trace(m_documentLoader);
   FetchContext::trace(visitor);
 }
 
 }  // namespace blink