Mojo C++ bindings: share DataView class between chromium and blink variants.

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

Index: mojo/public/tools/bindings/generators/cpp_templates/struct_traits_declaration.tmpl
diff --git a/mojo/public/tools/bindings/generators/cpp_templates/struct_traits_declaration.tmpl b/mojo/public/tools/bindings/generators/cpp_templates/struct_traits_declaration.tmpl
new file mode 100644
index 0000000000000000000000000000000000000000..24efbd5531064d623c8922793359cd78f98022ac
--- /dev/null
+++ b/mojo/public/tools/bindings/generators/cpp_templates/struct_traits_declaration.tmpl
@@ -0,0 +1,26 @@
+{%- set mojom_type = struct|get_qualified_name_for_kind %}
+
+template <>
+struct {{export_attribute}} StructTraits<{{mojom_type}}::DataView,
+                                         {{mojom_type}}Ptr> {
+  static bool IsNull(const {{mojom_type}}Ptr& input) { return !input; }
+  static void SetToNull({{mojom_type}}Ptr* output) { output->reset(); }
+
+{%- for field in struct.fields %}
+{%-   set return_ref = field.kind|is_object_kind or
+                       field.kind|is_any_handle_or_interface_kind %}
+{%-   if return_ref %}
+  static decltype({{mojom_type}}::{{field.name}})& {{field.name}}(
+      {{mojom_type}}Ptr& input) {
+    return input->{{field.name}};
+  }
+{%-   else %}
+  static decltype({{mojom_type}}::{{field.name}}) {{field.name}}(
+      const {{mojom_type}}Ptr& input) {
+    return input->{{field.name}};
+  }
+{%-   endif %}
+{%- endfor %}
+
+  static bool Read({{mojom_type}}::DataView input, {{mojom_type}}Ptr* output);
+};