Cpp bindings: add typedef for callbacks.

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

Index: mojo/public/tools/bindings/generators/cpp_templates/interface_declaration.tmpl
diff --git a/mojo/public/tools/bindings/generators/cpp_templates/interface_declaration.tmpl b/mojo/public/tools/bindings/generators/cpp_templates/interface_declaration.tmpl
index 30d20d8993e601f078e81340bba453341494eb4c..22e03ed55cd200fb16ee47d1b8730e9a24bb55dd 100644
--- a/mojo/public/tools/bindings/generators/cpp_templates/interface_declaration.tmpl
+++ b/mojo/public/tools/bindings/generators/cpp_templates/interface_declaration.tmpl
@@ -44,6 +44,9 @@ class {{interface.name}} {
   virtual ~{{interface.name}}() {}
 
 {%- for method in interface.methods %}
+{%    if method.response_parameters != None %}
+  typedef {{interface_macros.declare_callback(method)}} {{method.name}}Callback;

[jamesr, 2015/01/28 17:25:32]

can you use the 'using' syntax instead? i.e.

using {{method.name}}Callback = {{interface_macros...}};

that's what our style guide recommends and marginally easier to parse for humans
(imo) since the name of the type alias is at the beginning instead of buried at
the end

[yzshen1, 2015/01/28 18:30:43]

Done.

+{%-   endif %}
   virtual void {{method.name}}({{interface_macros.declare_request_params("", method)}}) = 0;
 {%- endfor %}
 };