Enforce referrer policies for workers

Source/core/dom/ExecutionContext.cpp

Index: Source/core/dom/ExecutionContext.cpp
diff --git a/Source/core/dom/ExecutionContext.cpp b/Source/core/dom/ExecutionContext.cpp
index a559d1c459d0b23cf46a16752ff19ece544d013a..1657d55b4d42b019b062c9f1cfe777d3ddb33259 100644
--- a/Source/core/dom/ExecutionContext.cpp
+++ b/Source/core/dom/ExecutionContext.cpp
@@ -73,6 +73,7 @@ ExecutionContext::ExecutionContext()
     , m_strictMixedContentCheckingEnforced(false)
     , m_windowInteractionTokens(0)
     , m_isRunSuspendableTasksScheduled(false)
+    , m_referrerPolicy(ReferrerPolicyDefault)
 {
 }
 
@@ -248,6 +249,12 @@ bool ExecutionContext::isWindowInteractionAllowed() const
     return m_windowInteractionTokens > 0;
 }
 
+void ExecutionContext::setReferrerPolicy(ReferrerPolicy referrerPolicy)
+{
+    // FIXME: Can we adopt the CSP referrer policy merge algorithm? Or does the web rely on being able to modify the referrer policy in-flight?
+    m_referrerPolicy = referrerPolicy;
+}
+
 void ExecutionContext::removeURLFromMemoryCache(const KURL& url)
 {
     memoryCache()->removeURLFromCache(url);