Remove LinkPreload resource type

third_party/WebKit/Source/core/fetch/ResourceFetcher.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
     Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
@@ skipping 64 matching lines @@
         break;                                                                                                                                                              \
     }
 
 #define DEFINE_RESOURCE_HISTOGRAM(prefix)                        \
     switch (factory.type()) {                                    \
         DEFINE_SINGLE_RESOURCE_HISTOGRAM(prefix, CSSStyleSheet)  \
         DEFINE_SINGLE_RESOURCE_HISTOGRAM(prefix, Font)           \
         DEFINE_SINGLE_RESOURCE_HISTOGRAM(prefix, Image)          \
         DEFINE_SINGLE_RESOURCE_HISTOGRAM(prefix, ImportResource) \
         DEFINE_SINGLE_RESOURCE_HISTOGRAM(prefix, LinkPrefetch)   \
-        DEFINE_SINGLE_RESOURCE_HISTOGRAM(prefix, LinkPreload)    \

[Charlie Harrison, 2016/08/18 21:31:34]

Update histograms.xml with this change. Not sure what the best approach is but
you may have to <obsolete> the histogram and make a new one?

         DEFINE_SINGLE_RESOURCE_HISTOGRAM(prefix, MainResource)   \
         DEFINE_SINGLE_RESOURCE_HISTOGRAM(prefix, Manifest)       \
         DEFINE_SINGLE_RESOURCE_HISTOGRAM(prefix, Media)          \
         DEFINE_SINGLE_RESOURCE_HISTOGRAM(prefix, Raw)            \
         DEFINE_SINGLE_RESOURCE_HISTOGRAM(prefix, Script)         \
         DEFINE_SINGLE_RESOURCE_HISTOGRAM(prefix, SVGDocument)    \
         DEFINE_SINGLE_RESOURCE_HISTOGRAM(prefix, TextTrack)      \
         DEFINE_SINGLE_RESOURCE_HISTOGRAM(prefix, XSLStyleSheet)  \
     }
 
@@ skipping 17 matching lines @@
         ASSERT(RuntimeEnabledFeatures::xsltEnabled());
     case Resource::Raw:
     case Resource::ImportResource:
     case Resource::Script:
         // Also visible resources/images (set explicitly in loadPriority)
         return ResourceLoadPriorityHigh;
     case Resource::Manifest:
         // Also late-body scripts discovered by the preload scanner (set explicitly in loadPriority)
         return ResourceLoadPriorityMedium;
     case Resource::Image:
-    case Resource::LinkPreload:

[Charlie Harrison, 2016/08/18 21:31:34]

If we move LinkPreload -> Raw, will this accidentally bump priorities from Low
to High? If this will be overridden in loadPriority let's add a comment (I think
that's what will happen...).

     case Resource::TextTrack:
     case Resource::Media:
     case Resource::SVGDocument:
         // Also async scripts (set explicitly in loadPriority)
         return ResourceLoadPriorityLow;
     case Resource::LinkPrefetch:
         return ResourceLoadPriorityVeryLow;
     }
 
     ASSERT_NOT_REACHED();
@@ skipping 59 matching lines @@
     case Resource::Font:
         return WebURLRequest::RequestContextFont;
     case Resource::Image:
         return WebURLRequest::RequestContextImage;
     case Resource::Raw:
         return WebURLRequest::RequestContextSubresource;
     case Resource::ImportResource:
         return WebURLRequest::RequestContextImport;
     case Resource::LinkPrefetch:
         return WebURLRequest::RequestContextPrefetch;
-    case Resource::LinkPreload:
-        return WebURLRequest::RequestContextSubresource;
     case Resource::TextTrack:
         return WebURLRequest::RequestContextTrack;
     case Resource::SVGDocument:
         return WebURLRequest::RequestContextImage;
     case Resource::Media: // TODO: Split this.
         return WebURLRequest::RequestContextVideo;
     case Resource::Manifest:
         return WebURLRequest::RequestContextManifest;
     }
     ASSERT_NOT_REACHED();
@@ skipping 1104 matching lines @@
     visitor->trace(m_context);
     visitor->trace(m_archive);
     visitor->trace(m_loaders);
     visitor->trace(m_nonBlockingLoaders);
     visitor->trace(m_documentResources);
     visitor->trace(m_preloads);
     visitor->trace(m_resourceTimingInfoMap);
 }
 
 } // namespace blink