Add basic Referrer-Policy support for Documents

third_party/WebKit/Source/platform/network/HTTPParsers.cpp

Index: third_party/WebKit/Source/platform/network/HTTPParsers.cpp
diff --git a/third_party/WebKit/Source/platform/network/HTTPParsers.cpp b/third_party/WebKit/Source/platform/network/HTTPParsers.cpp
index 1d6c44a9753f80697821f052174a74be2649ff35..5fa0a8e0c66dbf857b968c967f068f3d0def3aa2 100644
--- a/third_party/WebKit/Source/platform/network/HTTPParsers.cpp
+++ b/third_party/WebKit/Source/platform/network/HTTPParsers.cpp
@@ -33,6 +33,7 @@
 #include "platform/network/HTTPParsers.h"
 
 #include "platform/ParsingUtilities.h"
+#include "platform/weborigin/SecurityPolicy.h"
 #include "platform/weborigin/Suborigin.h"
 #include "wtf/DateMath.h"
 #include "wtf/MathExtras.h"
@@ -748,4 +749,20 @@ bool parseSuboriginHeader(const String& header, Suborigin* suborigin, WTF::Vecto
     return true;
 }
 
+// TODO(estark): add parse error messages like suborigins
+// has. https://crbug.com/621248
+ReferrerPolicy parseReferrerPolicyHeader(const String& header)
+{
+    Vector<String> headers;
+    header.split(',', true, headers);
+    ReferrerPolicy result = ReferrerPolicyDefault;
+    for (const auto& header : headers) {
+        ReferrerPolicy currentResult;
+        if (SecurityPolicy::referrerPolicyFromString(header, &currentResult)) {
+            result = currentResult;
+        }
+    }
+    return result;
+}
+
 } // namespace blink