Enable transmitting Fetch Requests over Mojo

third_party/WebKit/Source/platform/mojo/ReferrerStructTraits.h

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ReferrerStructTraits_h
+#define ReferrerStructTraits_h
+
+#include "platform/weborigin/Referrer.h"
+#include "platform/weborigin/ReferrerPolicy.h"
+#include "public/platform/ReferrerPolicyEnumTraits.h"
+#include "public/platform/WebReferrerPolicy.h"
+#include "wtf/Assertions.h"
+
+namespace mojo {
+
+template <>
+struct StructTraits<blink::mojom::ReferrerDataView, blink::Referrer> {
+  static blink::KURL url(const blink::Referrer& referrer) {
+    if (referrer.referrer == blink::Referrer::noReferrer())
+      return blink::KURL();
+
+    return blink::KURL(blink::KURL(), referrer.referrer);
+  }
+
+  // Equality of values is asserted in //Source/web/AssertMatchingEnums.cpp.
+  static blink::WebReferrerPolicy policy(const blink::Referrer& referrer) {
+    return static_cast<blink::WebReferrerPolicy>(referrer.referrerPolicy);
+  }
+
+  static bool Read(blink::mojom::ReferrerDataView data, blink::Referrer* out) {
+    blink::KURL referrer;
+    blink::WebReferrerPolicy webReferrerPolicy;
+    if (!data.ReadUrl(&referrer) || !data.ReadPolicy(&webReferrerPolicy))
+      return false;
+
+    out->referrerPolicy = static_cast<blink::ReferrerPolicy>(webReferrerPolicy);
+    out->referrer = AtomicString(referrer.getString());
+
+    // Mimics the ASSERT() done in the blink::Referrer constructor.
+    return referrer.isValid() || out->referrer == blink::Referrer::noReferrer();
+  }
+};
+
+}  // namespace mojo
+
+#endif  // ReferrerStructTraits_h