Apply meta tag referrer policy for preloaded requests

Source/core/html/parser/ResourcePreloader.h

Index: Source/core/html/parser/ResourcePreloader.h
diff --git a/Source/core/html/parser/ResourcePreloader.h b/Source/core/html/parser/ResourcePreloader.h
index d27c0e12b8c06011f2f43ed1f0864522e862bb6f..229d3032b7a90ff29e4edef90174167c9690bc83 100644
--- a/Source/core/html/parser/ResourcePreloader.h
+++ b/Source/core/html/parser/ResourcePreloader.h
@@ -13,6 +13,8 @@ namespace blink {
 class CORE_EXPORT ResourcePreloader {
 public:
     virtual void takeAndPreload(PreloadRequestStream&);
+    virtual void preloadReferrerPolicy(const String& policy) = 0;
+
 private:
     virtual void preload(PassOwnPtr<PreloadRequest>) = 0;
 };