Add basic Referrer-Policy support for Documents

third_party/WebKit/Source/core/dom/ExecutionContext.cpp

Index: third_party/WebKit/Source/core/dom/ExecutionContext.cpp
diff --git a/third_party/WebKit/Source/core/dom/ExecutionContext.cpp b/third_party/WebKit/Source/core/dom/ExecutionContext.cpp
index 6cd1f1172f45776b24102b9d53ecc4a7603ced27..4251bcfb313dc117e60fa29e757f1e7e3ce0a0b4 100644
--- a/third_party/WebKit/Source/core/dom/ExecutionContext.cpp
+++ b/third_party/WebKit/Source/core/dom/ExecutionContext.cpp
@@ -34,9 +34,11 @@
 #include "core/fetch/MemoryCache.h"
 #include "core/frame/UseCounter.h"
 #include "core/html/PublicURLManager.h"
+#include "core/inspector/ConsoleMessage.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "core/workers/WorkerThread.h"
+#include "platform/weborigin/SecurityPolicy.h"
 #include "wtf/PtrUtil.h"
 #include <memory>
 
@@ -252,6 +254,27 @@ String ExecutionContext::outgoingReferrer() const
     return url().strippedForUseAsReferrer();
 }
 
+void ExecutionContext::parseAndSetReferrerPolicy(const String& policies)
+{
+    ReferrerPolicy referrerPolicy = ReferrerPolicyDefault;
+
+    Vector<String> tokens;
+    policies.split(',', true, tokens);
+    for (const auto& token : tokens) {
+        ReferrerPolicy currentResult;
+        if (SecurityPolicy::referrerPolicyFromString(token, &currentResult)) {
+            referrerPolicy = currentResult;
+        }
+    }
+
+    if (referrerPolicy == ReferrerPolicyDefault) {
+        addConsoleMessage(ConsoleMessage::create(RenderingMessageSource, ErrorMessageLevel, "Failed to set referrer policy: The value '" + policies + "' is not one of 'always', 'default', 'never', 'no-referrer', 'no-referrer-when-downgrade', 'origin', 'origin-when-crossorigin', or 'unsafe-url'. The referrer policy has been left unchanged."));
+        return;
+    }
+
+    setReferrerPolicy(referrerPolicy);
+}
+
 void ExecutionContext::setReferrerPolicy(ReferrerPolicy referrerPolicy)
 {
     // When a referrer policy has already been set, the latest value takes precedence.