Add link preload as=document support

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

 /*
  * Copyright (C) 2011 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 168 matching lines @@
     } else if (as == "script") {
         type = Resource::Script;
     } else if (as == "style") {
         type = Resource::CSSStyleSheet;
     } else if (as == "media") {
         type = Resource::Media;
     } else if (as == "font") {
         type = Resource::Font;
     } else if (as == "track") {
         type = Resource::TextTrack;
+    } else if (as == "document") {
+        type = Resource::MainResource;
     } else {
         type = Resource::Raw;
         if (!as.isEmpty())
             return false;
     }
     return true;
 }
 
 void LinkLoader::createLinkPreloadResourceClient(Resource* resource)
 {
     if (!resource)
         return;
     switch (resource->getType()) {
     case Resource::Image:
         m_linkPreloadResourceClient = LinkPreloadImageResourceClient::create(this, toImageResource(resource));
         break;
     case Resource::Script:
         m_linkPreloadResourceClient = LinkPreloadScriptResourceClient::create(this, toScriptResource(resource));
         break;
     case Resource::CSSStyleSheet:
         m_linkPreloadResourceClient = LinkPreloadStyleResourceClient::create(this, toCSSStyleSheetResource(resource));
         break;
     case Resource::Font:
         m_linkPreloadResourceClient = LinkPreloadFontResourceClient::create(this, toFontResource(resource));
         break;
+    case Resource::MainResource:
+        m_linkPreloadResourceClient = LinkPreloadRawResourceClient::create(this, toRawResource(resource));
+        break;
     case Resource::Media:
     case Resource::TextTrack:
     case Resource::Raw:
         m_linkPreloadResourceClient = LinkPreloadRawResourceClient::create(this, toRawResource(resource));
         break;
     default:
         ASSERT_NOT_REACHED();
     }
 }
 
 static bool isSupportedType(Resource::Type resourceType, const String& mimeType)
 {
     if (mimeType.isEmpty())
         return true;
     switch (resourceType) {
     case Resource::Image:
         return MIMETypeRegistry::isSupportedImagePrefixedMIMEType(mimeType);
     case Resource::Script:
         return MIMETypeRegistry::isSupportedJavaScriptMIMEType(mimeType);
     case Resource::CSSStyleSheet:
         return MIMETypeRegistry::isSupportedStyleSheetMIMEType(mimeType);
     case Resource::Font:
         return MIMETypeRegistry::isSupportedFontMIMEType(mimeType);
     case Resource::Media:
         return MIMETypeRegistry::isSupportedMediaSourceMIMEType(mimeType, String());
     case Resource::TextTrack:
         return MIMETypeRegistry::isSupportedTextTrackMIMEType(mimeType);
     case Resource::Raw:
+    case Resource::MainResource:
         return true;
     default:
         ASSERT_NOT_REACHED();
     }
     return false;
 }
 
 static Resource* preloadIfNeeded(const LinkRelAttribute& relAttribute, const KURL& href, Document& document, const String& as, const String& mimeType,
     const String& media, CrossOriginAttributeValue crossOrigin, LinkCaller caller, bool& errorOccurred, ViewportDescription* viewportDescription)
 {
@@ skipping 24 matching lines @@
         document.addConsoleMessage(ConsoleMessage::create(OtherMessageSource, WarningMessageLevel, String("<link rel=preload> must have a valid `as` value")));
         errorOccurred = true;
         return nullptr;
     }
 
     if (!isSupportedType(resourceType, mimeType)) {
         document.addConsoleMessage(ConsoleMessage::create(OtherMessageSource, WarningMessageLevel, String("<link rel=preload> has an unsupported `type` value")));
         return nullptr;
     }
     ResourceRequest resourceRequest(document.completeURL(href));
+    if (resourceType == Resource::MainResource)
+        resourceRequest.setFrameType(WebURLRequest::FrameTypePreload);
     ResourceFetcher::determineRequestContext(resourceRequest, resourceType, false);
     FetchRequest linkRequest(resourceRequest, FetchInitiatorTypeNames::link, document.encodingName());
 
     if (crossOrigin != CrossOriginAttributeNotSet)
         linkRequest.setCrossOriginAccessControl(document.getSecurityOrigin(), crossOrigin);
     Settings* settings = document.settings();
     if (settings && settings->logPreload())
         document.addConsoleMessage(ConsoleMessage::create(OtherMessageSource, DebugMessageLevel, String("Preload triggered for " + href.host() + href.path())));
     linkRequest.setForPreload(true, monotonicallyIncreasingTime());
     linkRequest.setLinkPreload(true);
@@ skipping 96 matching lines @@
 DEFINE_TRACE(LinkLoader)
 {
     visitor->trace(m_client);
     visitor->trace(m_prerender);
     visitor->trace(m_linkPreloadResourceClient);
     ResourceOwner<Resource, ResourceClient>::trace(visitor);
     PrerenderClient::trace(visitor);
 }
 
 } // namespace blink