Add ReferrerPolicy support to preload

third_party/WebKit/Source/core/html/HTMLLinkElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLLinkElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLLinkElement.cpp b/third_party/WebKit/Source/core/html/HTMLLinkElement.cpp
index 4218572b31a22db8d713a0e464814c9481653d25..378553ebc8929d21080e940434ea9bbec60cfd9e 100644
--- a/third_party/WebKit/Source/core/html/HTMLLinkElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLLinkElement.cpp
@@ -103,6 +103,8 @@ void HTMLLinkElement::parseAttribute(const QualifiedName& name,
   } else if (name == asAttr) {
     m_as = value;
     process();
+  } else if (name == referrerpolicyAttr) {
+    m_referrerPolicy = value;
   } else if (name == sizesAttr) {
     m_sizes->setValue(value);
   } else if (name == mediaAttr) {
@@ -132,11 +134,13 @@ bool HTMLLinkElement::shouldLoadLink() {
 bool HTMLLinkElement::loadLink(const String& type,
                                const String& as,
                                const String& media,
+                               const String& referrerPolicy,
                                const KURL& url) {
   return m_linkLoader->loadLink(
       m_relAttribute,
       crossOriginAttributeValue(fastGetAttribute(HTMLNames::crossoriginAttr)),
-      type, as, media, url, document(), NetworkHintsInterfaceImpl());
+      type, as, media, referrerPolicy, url, document(),
+      NetworkHintsInterfaceImpl());
 }
 
 LinkResource* HTMLLinkElement::linkResourceToProcess() {
@@ -618,6 +622,7 @@ void LinkStyle::process() {
   String type = m_owner->typeValue().lower();
   String as = m_owner->asValue().lower();
   String media = m_owner->media().lower();
+  String referrerPolicy = m_owner->referrerPolicy().lower();
   LinkRequestBuilder builder(m_owner);
 
   if (m_owner->relAttribute().getIconType() != InvalidIcon &&
@@ -634,7 +639,7 @@ void LinkStyle::process() {
           m_owner->relAttribute().getIconType());
   }
 
-  if (!m_owner->loadLink(type, as, media, builder.url()))
+  if (!m_owner->loadLink(type, as, media, referrerPolicy, builder.url()))
     return;
 
   if (m_disabledState != Disabled && m_owner->relAttribute().isStyleSheet() &&