Add basic Referrer-Policy support for Documents

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

Index: third_party/WebKit/Source/core/loader/FrameLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/FrameLoader.cpp b/third_party/WebKit/Source/core/loader/FrameLoader.cpp
index 8be7514cc67d7bc098861f0535720d03c1da2c37..73b5374e1fb259a7c7e283ebc37fa32fa832e0c7 100644
--- a/third_party/WebKit/Source/core/loader/FrameLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/FrameLoader.cpp
@@ -85,6 +85,7 @@
 #include "core/xml/parser/XMLDocumentParser.h"
 #include "platform/Logging.h"
 #include "platform/PluginScriptForbiddenScope.h"
+#include "platform/RuntimeEnabledFeatures.h"
 #include "platform/ScriptForbiddenScope.h"
 #include "platform/TraceEvent.h"
 #include "platform/UserGestureIndicator.h"
@@ -515,6 +516,13 @@ void FrameLoader::didBeginDocument()
         OriginTrialContext::addTokensFromHeader(m_frame->document(), m_documentLoader->response().httpHeaderField(HTTPNames::Origin_Trial));
     }
 
+    if (m_documentLoader && RuntimeEnabledFeatures::referrerPolicyHeaderEnabled()) {
+        String referrerPolicyHeader = m_documentLoader->response().httpHeaderField(HTTPNames::Referrer_Policy);
+        if (!referrerPolicyHeader.isNull()) {
+            m_frame->document()->parseAndSetReferrerPolicy(referrerPolicyHeader);
+        }
+    }
+
     client()->didCreateNewDocument();
 }