Add ReferrerPolicy support to preload

third_party/WebKit/Source/platform/network/LinkHeader.cpp

Index: third_party/WebKit/Source/platform/network/LinkHeader.cpp
diff --git a/third_party/WebKit/Source/platform/network/LinkHeader.cpp b/third_party/WebKit/Source/platform/network/LinkHeader.cpp
index d3ce2261c7d33cf3f2297691247f9b2ba17fb373..67f1b26c5cf08baa2031d97643364411b1a8aebc 100644
--- a/third_party/WebKit/Source/platform/network/LinkHeader.cpp
+++ b/third_party/WebKit/Source/platform/network/LinkHeader.cpp
@@ -35,6 +35,8 @@ static LinkHeader::LinkParameterName parameterNameFromString(
     return LinkHeader::LinkParameterHreflang;
   if (base::EqualsCaseInsensitiveASCII(name, "as"))
     return LinkHeader::LinkParameterAs;
+  if (base::EqualsCaseInsensitiveASCII(name, "referrerpolicy"))
+    return LinkHeader::LinkParameterReferrerPolicy;
   return LinkHeader::LinkParameterUnknown;
 }
 
@@ -47,6 +49,8 @@ void LinkHeader::setValue(LinkParameterName name, const String& value) {
     m_crossOrigin = value;
   else if (name == LinkParameterAs)
     m_as = value.lower();
+  else if (name == LinkParameterReferrerPolicy)
+    m_referrerPolicy = value.lower();
   else if (name == LinkParameterType)
     m_mimeType = value.lower();
   else if (name == LinkParameterMedia)