Add ReferrerPolicy support to preload

third_party/WebKit/Source/core/loader/LinkLoader.cpp

Index: third_party/WebKit/Source/core/loader/LinkLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/LinkLoader.cpp b/third_party/WebKit/Source/core/loader/LinkLoader.cpp
index 4d80182e8987cc079191209a35d856c5b810e577..116562a71b6f03a03be0b8963446d9fa7ac18fd3 100644
--- a/third_party/WebKit/Source/core/loader/LinkLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/LinkLoader.cpp
@@ -269,7 +269,8 @@ static Resource* preloadIfNeeded(const LinkRelAttribute& relAttribute,
                                  CrossOriginAttributeValue crossOrigin,
                                  LinkCaller caller,
                                  bool& errorOccurred,
-                                 ViewportDescription* viewportDescription) {
+                                 ViewportDescription* viewportDescription,
+                                 ReferrerPolicy referrerPolicy) {
   if (!document.loader() || !relAttribute.isLinkPreload())
     return nullptr;
 
@@ -316,6 +317,12 @@ static Resource* preloadIfNeeded(const LinkRelAttribute& relAttribute,
   ResourceRequest resourceRequest(document.completeURL(href));
   ResourceFetcher::determineRequestContext(resourceRequest, resourceType,
                                            false);
+
+  if (referrerPolicy != ReferrerPolicyDefault) {
+    resourceRequest.setHTTPReferrer(SecurityPolicy::generateReferrer(
+        referrerPolicy, href, document.outgoingReferrer()));
+  }
+
   FetchRequest linkRequest(resourceRequest, FetchInitiatorTypeNames::link,
                            document.encodingName());
 
@@ -373,10 +380,18 @@ void LinkLoader::loadLinksFromHeader(
           (viewportDescriptionWrapper && viewportDescriptionWrapper->set)
               ? &(viewportDescriptionWrapper->description)
               : nullptr;
+
+      ReferrerPolicy referrerPolicy = ReferrerPolicyDefault;
+      if (!header.referrerPolicy().isNull()) {
+        SecurityPolicy::referrerPolicyFromStringWithLegacyKeywords(

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

Same question regarding legacy.

+            header.referrerPolicy(), &referrerPolicy);
+      }
+
       preloadIfNeeded(relAttribute, url, *document, header.as(),
                       header.mimeType(), header.media(),
                       crossOriginAttributeValue(header.crossOrigin()),
-                      LinkCalledFromHeader, errorOccurred, viewportDescription);
+                      LinkCalledFromHeader, errorOccurred, viewportDescription,
+                      referrerPolicy);
     }
     // TODO(yoav): Add more supported headers as needed.
   }
@@ -387,6 +402,7 @@ bool LinkLoader::loadLink(const LinkRelAttribute& relAttribute,
                           const String& type,
                           const String& as,
                           const String& media,
+                          const String& referrerPolicyString,
                           const KURL& href,
                           Document& document,
                           const NetworkHintsInterface& networkHintsInterface) {
@@ -404,10 +420,15 @@ bool LinkLoader::loadLink(const LinkRelAttribute& relAttribute,
                      networkHintsInterface, LinkCalledFromMarkup);
 
   bool errorOccurred = false;
+  ReferrerPolicy referrerPolicy = ReferrerPolicyDefault;
+  if (!referrerPolicyString.isNull()) {
+    SecurityPolicy::referrerPolicyFromStringWithLegacyKeywords(

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

Ditto.

+        referrerPolicyString, &referrerPolicy);
+  }
   if (m_client->shouldLoadLink()) {
     createLinkPreloadResourceClient(preloadIfNeeded(
         relAttribute, href, document, as, type, media, crossOrigin,
-        LinkCalledFromMarkup, errorOccurred, nullptr));
+        LinkCalledFromMarkup, errorOccurred, nullptr, referrerPolicy));
   }
   if (errorOccurred)
     m_linkLoadingErrorTimer.startOneShot(0, BLINK_FROM_HERE);