Implement referrerpolicy attribute for img elements

Source/core/html/HTMLImageElement.cpp

Index: Source/core/html/HTMLImageElement.cpp
diff --git a/Source/core/html/HTMLImageElement.cpp b/Source/core/html/HTMLImageElement.cpp
index f6d39f0c885c1a734ffba8092e779063de159c56..8b7c1ea5f99b6bf71c668046fe00285a8a3bcdfa 100644
--- a/Source/core/html/HTMLImageElement.cpp
+++ b/Source/core/html/HTMLImageElement.cpp
@@ -51,6 +51,7 @@
 #include "platform/EventDispatchForbiddenScope.h"
 #include "platform/MIMETypeRegistry.h"
 #include "platform/RuntimeEnabledFeatures.h"
+#include "platform/weborigin/SecurityPolicy.h"
 
 namespace blink {
 
@@ -385,7 +386,7 @@ Node::InsertionNotificationRequest HTMLImageElement::insertedInto(ContainerNode*
     // If we have been inserted from a layoutObject-less document,
     // our loader may have not fetched the image, so do it now.
     if ((insertionPoint->inDocument() && !imageLoader().image()) || imageWasModified)
-        imageLoader().updateFromElement(ImageLoader::UpdateNormal);
+        imageLoader().updateFromElement(ImageLoader::UpdateNormal, referrerPolicy());
 
     return HTMLElement::insertedInto(insertionPoint);
 }
@@ -660,7 +661,7 @@ float HTMLImageElement::sourceSize(Element& element)
 
 void HTMLImageElement::forceReload() const
 {
-    imageLoader().updateFromElement(ImageLoader::UpdateForcedReload);
+    imageLoader().updateFromElement(ImageLoader::UpdateForcedReload, referrerPolicy());
 }
 
 void HTMLImageElement::selectSourceURL(ImageLoader::UpdateFromElementBehavior behavior)
@@ -683,7 +684,7 @@ void HTMLImageElement::selectSourceURL(ImageLoader::UpdateFromElementBehavior be
         m_listener = ViewportChangeListener::create(this);
         document().mediaQueryMatcher().addViewportListener(m_listener);
     }
-    imageLoader().updateFromElement(behavior);
+    imageLoader().updateFromElement(behavior, referrerPolicy());
 
     if (imageLoader().image() || (imageLoader().hasPendingActivity() && !imageSourceURL().isEmpty()))
         ensurePrimaryContent();
@@ -759,4 +760,13 @@ bool HTMLImageElement::isOpaque() const
     return image && image->currentFrameKnownToBeOpaque();
 }
 
+ReferrerPolicy HTMLImageElement::referrerPolicy() const
+{
+    ReferrerPolicy policy = ReferrerPolicyDefault;
+    if (RuntimeEnabledFeatures::referrerPolicyAttributeEnabled() && hasAttribute(referrerpolicyAttr)) {
+        SecurityPolicy::referrerPolicyFromString(fastGetAttribute(referrerpolicyAttr), &policy);
+    }
+
+    return policy;
+}

[Yoav Weiss, 2015/08/18 07:22:17]

Processing the referrer every time referrerPolicy() is called means that you'd
have to translate it from string each time. It's better to process it once in
parseAttribute() and on relevant mutations (if there are any).

Also, missed a newline :)

[estark, 2015/08/18 17:34:26]

Done.

 }