Use compositor_frame typemap in Blink

mojo/common/common_custom_types_struct_traits.cc

Index: mojo/common/common_custom_types_struct_traits.cc
diff --git a/mojo/common/common_custom_types_struct_traits.cc b/mojo/common/common_custom_types_struct_traits.cc
index 62e2d6385e4f5ff3403b0326450b136d42487591..232f8977a9af53a92f7279790866be1800f8b35b 100644
--- a/mojo/common/common_custom_types_struct_traits.cc
+++ b/mojo/common/common_custom_types_struct_traits.cc
@@ -11,6 +11,18 @@
 namespace mojo {
 
 // static
+bool StructTraits<mojo::common::mojom::VersionDataView, base::Version>::IsNull(
+    const base::Version& version) {
+  return !version.IsValid();
+}
+
+// static
+void StructTraits<mojo::common::mojom::VersionDataView,
+                  base::Version>::SetToNull(base::Version* out) {
+  *out = base::Version(std::string());
+}
+
+// static
 const std::vector<uint32_t>&
 StructTraits<mojo::common::mojom::VersionDataView, base::Version>::components(
     const base::Version& version) {