Don't wait for AppCache for link rel preloads

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

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  * 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 190 matching lines @@
         break;
     default:
         ASSERT_NOT_REACHED();
     }
 
     if (resource)
         fetcher()->preloadStarted(resource);
     return resource;
 }
 
+void DocumentLoader::dispatchLinkHeaderPreloads(ViewportDescriptionWrapper* viewport, LinkLoader::MediaPreloadPolicy mediaPolicy)
+{
+    String linkHeader = response().httpHeaderField(HTTPNames::Link);
+    if (!linkHeader.isEmpty()) {

[Yoav Weiss, 2016/07/22 16:03:46]

Why is this wrapper needed? There's already an empty check inside
loadLinksFromHeader

[Charlie Harrison, 2016/07/22 16:54:24]

Ah good catch. Removed. I still kept this helper function to avoid awkward
callsites reaching deep into document()->loader().

+        LinkLoader::loadLinksFromHeader(linkHeader, response().url(),
+            m_frame->document(), NetworkHintsInterfaceImpl(), LinkLoader::OnlyLoadResources, mediaPolicy, viewport);
+    }
+}
+
 void DocumentLoader::didChangePerformanceTiming()
 {
     if (frame() && frame()->isMainFrame() && m_state >= Committed) {
         frameLoader()->client()->didChangePerformanceTiming();
     }
 }
 
 void DocumentLoader::didObserveLoadingBehavior(WebLoadingBehaviorFlag behavior)
 {
     if (frame() && frame()->isMainFrame()) {
@@ skipping 484 matching lines @@
 {
     m_writer = createWriterFor(init, mimeType(), m_writer ? m_writer->encoding() : emptyAtom, true, ForceSynchronousParsing);
     if (!source.isNull())
         m_writer->appendReplacingData(source);
     endWriting(m_writer.get());
 }
 
 DEFINE_WEAK_IDENTIFIER_MAP(DocumentLoader);
 
 } // namespace blink