Mojo C++ bindings: introduce public associated-interface-related types.

mojo/public/cpp/bindings/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 source_set("bindings") {
   sources = [
     "array.h",
+    "associated_binding.h",
+    "associated_group.h",
+    "associated_interface_ptr.h",
     "associated_interface_ptr_info.h",
     "associated_interface_request.h",
     "binding.h",
     "interface_ptr.h",
     "interface_ptr_info.h",
     "interface_request.h",
     "lib/array_internal.cc",
     "lib/array_internal.h",
     "lib/array_serialization.h",
+    "lib/associated_group.cc",
+    "lib/associated_interface_ptr_internal.h",
     "lib/bindings_internal.h",
     "lib/bindings_serialization.cc",
     "lib/bindings_serialization.h",
     "lib/bounds_checker.cc",
     "lib/bounds_checker.h",
     "lib/buffer.h",
     "lib/connector.cc",
     "lib/connector.h",
     "lib/control_message_handler.cc",
     "lib/control_message_handler.h",
@@ skipping 69 matching lines @@
     "lib/template_util.h",
     "lib/thread_checker.h",
     "lib/thread_checker_posix.cc",
     "lib/thread_checker_posix.h",
   ]
 
   deps = [
     "//mojo/public/cpp/system",
   ]
 }