Increase priority of XHR in ResourcePriorities experiment.

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 743 matching lines @@
 
     // Async/Defer scripts.
     if (type == Resource::Script && FetchRequest::LazyLoad == request.defer())
         return frame()->settings()->fetchIncreaseAsyncScriptPriority() ? ResourceLoadPriorityMedium : ResourceLoadPriorityLow;
 
     // Runtime experiment that change how we prioritize resources.
     // The toggles do not depend on each other and can be flipped individually
     // though the cumulative result will depend on the interaction between them.
     // Background doc: https://docs.google.com/document/d/1bCDuq9H1ih9iNjgzyAL0gpwNFiEP4TZS-YLRp_RuMlc/edit?usp=sharing
 
-    // Increases the priorities for CSS, Scripts, Fonts and Images all by one level
+    // Increases the priorities for CSS, Scripts, XHR, Fonts and Images all by one level
     // and parser-blocking scripts and visible images by 2.
     // This is used in conjunction with logic on the Chrome side to raise the threshold
     // of "layout-blocking" resources and provide a boost to resources that are needed
     // as soon as possible for something currently on the screen.
     int modifiedPriority = static_cast<int>(priority);
     if (frame()->settings()->fetchIncreasePriorities()) {
-        if (type == Resource::CSSStyleSheet || type == Resource::Script || type == Resource::Font || type == Resource::Image)
+        if (type == Resource::CSSStyleSheet || type == Resource::Script || type == Resource::Font || type == Resource::Image || type == Resource::Raw)
             modifiedPriority++;
     }
 
     // Always give visible resources a bump, and an additional bump if generally increasing priorities.
     if (visibility == ResourcePriority::Visible) {
         modifiedPriority++;
         if (frame()->settings()->fetchIncreasePriorities())
             modifiedPriority++;
     }
 
@@ skipping 25 matching lines @@
 }
 
 DEFINE_TRACE(FrameFetchContext)
 {
     visitor->trace(m_document);
     visitor->trace(m_documentLoader);
     FetchContext::trace(visitor);
 }
 
 } // namespace blink