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 9b402d3c27a141347a0b993a6164e753549fbd3b..b6591af0e56f8fc7a2b4791f069b18bfad06c251 100644
--- a/third_party/WebKit/Source/core/html/HTMLLinkElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLLinkElement.cpp
@@ -79,6 +79,8 @@ void HTMLLinkElement::parseAttribute(const QualifiedName& name,
   } else if (name == asAttr) {
     m_as = value;
     process();
+  } else if (name == referrerpolicyAttr) {
+    m_referrerPolicy = value;

[Mike West, 2016/10/23 05:25:46]

Where do you take the page's referrer policy into account? Shouldn't the request
fall back to that policy if no policy is explicitly set for the element?

[Yoav Weiss, 2016/10/23 13:27:09]

It's done at the consumers of HTMLLinkElement::referrerPolicy() (so, inside
LinkLoader). Doing it here might be better when support is extended beyond just
preload.

   } else if (name == sizesAttr) {
     m_sizes->setValue(value);
   } else if (name == mediaAttr) {
@@ -108,11 +110,13 @@ 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() {