Mojo C++ bindings: expose public <struct>DataView and StringDataView.

mojo/public/tools/bindings/generators/cpp_templates/interface_definition.tmpl

Index: mojo/public/tools/bindings/generators/cpp_templates/interface_definition.tmpl
diff --git a/mojo/public/tools/bindings/generators/cpp_templates/interface_definition.tmpl b/mojo/public/tools/bindings/generators/cpp_templates/interface_definition.tmpl
index 2100034b44c52adb23bb64a3d2cf279ac6f107cd..aef7e9d3d78ac3354f1183be91189099eb9fb8b1 100644
--- a/mojo/public/tools/bindings/generators/cpp_templates/interface_definition.tmpl
+++ b/mojo/public/tools/bindings/generators/cpp_templates/interface_definition.tmpl
@@ -12,8 +12,9 @@
 {%-   for param in struct.packed.packed_fields_in_ordinal_order %}
   {{param.field.kind|cpp_wrapper_type}} p_{{param.field.name}}{};
 {%-   endfor %}
-  {{struct_macros.deserialize(
-      struct, params, "p_%s", serialization_context, "success")}}
+  {{struct.name}}DataView input_data_view({{params}},
+                                          {{serialization_context}});
+  {{struct_macros.deserialize(struct, "input_data_view", "p_%s", "success")}}
   if (!success)
     return false;
 {%- endmacro %}