Mojo: Move mojo/public/bindings to mojo/public/tools/bindings.

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

-{%- import "interface_macros.tmpl" as interface_macros %}
-class {{interface.name}}Proxy;
-class {{interface.name}}Stub;
-{% if interface.peer %}
-class {{interface.peer}};
-{% endif %}
-
-class {{interface.name}} {
- public:
-  typedef {{interface.name}}Proxy _Proxy;
-  typedef {{interface.name}}Stub _Stub;
-{% if interface.peer %}
-  typedef {{interface.peer}} _Peer;
-{% else %}
-  typedef mojo::NoInterface _Peer;
-{% endif %}
-
-{#--- Enums #}
-{%- for enum in interface.enums %}
-{%    macro enum_def() %}{% include "enum_declaration.tmpl" %}{% endmacro %}
-  {{enum_def()|indent(2)}}
-{%- endfor %}
-
-{#--- Methods #}
-{%- for method in interface.methods %}
-  virtual void {{method.name}}({{interface_macros.declare_request_params(method)}}) = 0;
-{%- endfor %}
-};
-
-// A typesafe variant of MessagePipeHandle.
-typedef mojo::Interface<{{interface.name}}>::Handle {{interface.name}}Handle;
-
-// A typesafe variant of ScopedMessagePipeHandle.
-typedef mojo::Interface<{{interface.name}}>::ScopedHandle Scoped{{interface.name}}Handle;