Experiment with typemaps in Blink Modules

third_party/WebKit/Source/modules/background_fetch/BackgroundFetchStructTraits.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 BackgroundFetchStructTraits_h
+#define BackgroundFetchStructTraits_h
+
+#include "public/platform/modules/background_fetch/background_fetch.mojom-blink.h"
+#include "wtf/text/WTFString.h"
+
+namespace mojo {
+
+template <>
+struct StructTraits<blink::mojom::IconDefinitionDataView,
+                    blink::IconDefinition> {
+  static WTF::String src(const blink::IconDefinition& definition) {
+    return definition.src();
+  }
+
+  static WTF::String sizes(const blink::IconDefinition& definition) {
+    return definition.sizes();
+  }
+
+  static WTF::String type(const blink::IconDefinition& definition) {
+    return definition.type();
+  }
+
+  static bool Read(blink::mojom::IconDefinitionDataView input,
+                   blink::IconDefinition* out);
+};
+
+}  // namespace mojo
+
+#endif  // BackgroundFetchStructTraits_h