Add ReferrerPolicy support to preload

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

Index: third_party/WebKit/Source/platform/network/LinkHeader.h
diff --git a/third_party/WebKit/Source/platform/network/LinkHeader.h b/third_party/WebKit/Source/platform/network/LinkHeader.h
index 3a7c498a57fb022593108dd6bfbdb76a12ac7696..f8e59201e9cb8df495ed7052c8a7178c29abffb0 100644
--- a/third_party/WebKit/Source/platform/network/LinkHeader.h
+++ b/third_party/WebKit/Source/platform/network/LinkHeader.h
@@ -21,6 +21,7 @@ class LinkHeader {
   const String& mimeType() const { return m_mimeType; }
   const String& media() const { return m_media; }
   const String& crossOrigin() const { return m_crossOrigin; }
+  const String& referrerPolicy() const { return m_referrerPolicy; }
   bool valid() const { return m_isValid; }
 
   enum LinkParameterName {
@@ -35,6 +36,7 @@ class LinkHeader {
     LinkParameterUnknown,
     LinkParameterCrossOrigin,
     LinkParameterAs,
+    LinkParameterReferrerPolicy,
   };
 
  private:
@@ -50,6 +52,7 @@ class LinkHeader {
   String m_mimeType;
   String m_media;
   String m_crossOrigin;
+  String m_referrerPolicy;
   bool m_isValid;
 };