Experiment with typemaps in Blink Modules

third_party/WebKit/Source/modules/background_fetch/BackgroundFetchStructTraits.cpp

+// 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.
+
+#include "modules/background_fetch/BackgroundFetchStructTraits.h"
+
+#include "mojo/public/cpp/bindings/string_traits_wtf.h"
+
+namespace mojo {
+
+// static
+bool StructTraits<blink::mojom::IconDefinitionDataView, blink::IconDefinition>::
+    Read(blink::mojom::IconDefinitionDataView input,
+         blink::IconDefinition* out) {
+  WTF::String src, sizes, type;
+  if (!input.ReadSrc(&src) || !input.ReadSizes(&sizes) ||
+      !input.ReadType(&type)) {
+    return false;
+  }
+
+  out->setSrc(src);
+  out->setSizes(sizes);
+  out->setType(type);
+  return true;
+}
+
+}  // namespace mojo