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

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

 {#  TODO(yzshen): Make these templates more readable. #}
 
 {#  Computes the serialized size for the specified struct.
     |struct| is the struct definition.
     |input_field_pattern| should be a pattern that contains one string
     placeholder, for example, "input->%s", "p_%s". The placeholder will be
     substituted with struct field names to refer to the input fields.
     |context| is the name of the serialization context.
     |input_may_be_temp| indicates whether any input may be temporary obejcts.
     We need to assign temporary objects to local variables before passing it to
@@ skipping 130 matching lines @@
     - method parameters/response parameters: the output is a list of
       arguments. #}
 {%- macro deserialize(struct, input, output_field_pattern, success) -%}
 {%-   for pf in struct.packed.packed_fields_in_ordinal_order %}
 {%-     set output_field = output_field_pattern|format(pf.field.name) %}
 {%-     set name = pf.field.name %}
 {%-     set kind = pf.field.kind %}
 {%-     if kind|is_object_kind or kind|is_enum_kind %}
   if (!{{input}}.Read{{name|under_to_camel}}(&{{output_field}}))
     {{success}} = false;
-{%-     elif kind|is_any_handle_or_interface_kind %}
+{%-     elif kind|is_any_handle_kind %}
   {{output_field}} = {{input}}.Take{{name|under_to_camel}}();
+{%-     elif kind|is_any_interface_kind %}
+  {{output_field}} =
+      {{input}}.Take{{name|under_to_camel}}<decltype({{output_field}})>();
 {%-     else %}
   {{output_field}} = {{input}}.{{name}}();
 {%-     endif %}
 {%-   endfor %}
 {%- endmacro %}