Mojo C++ Bindings: Add helpers for bad message reporting

mojo/public/cpp/bindings/tests/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("tests") {
   testonly = true
 
   sources = [
     "array_common_test.h",
     "array_unittest.cc",
     "associated_interface_unittest.cc",
     "bind_task_runner_unittest.cc",
     "binding_callback_unittest.cc",
     "binding_unittest.cc",
     "buffer_unittest.cc",
     "connector_unittest.cc",
     "constant_unittest.cc",
     "container_test_util.cc",
     "container_test_util.h",
     "data_view_unittest.cc",
     "equals_unittest.cc",
     "handle_passing_unittest.cc",
     "interface_ptr_unittest.cc",
     "map_common_test.h",
     "map_unittest.cc",
     "message_queue.cc",
     "message_queue.h",
     "multiplex_router_unittest.cc",
+    "report_bad_message_unittest.cc",
     "request_response_unittest.cc",
     "router_test_util.cc",
     "router_test_util.h",
     "router_unittest.cc",
     "sample_service_unittest.cc",
     "serialization_warning_unittest.cc",
     "stl_converters_unittest.cc",
     "string_unittest.cc",
     "struct_unittest.cc",
     "sync_method_unittest.cc",
     "type_conversion_unittest.cc",
     "union_unittest.cc",
     "validation_context_unittest.cc",
     "validation_unittest.cc",
     "variant_test_util.h",
   ]
 
   deps = [
     ":mojo_public_bindings_test_utils",
+    "//mojo/edk/system",
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/system",
     "//mojo/public/cpp/test_support:test_utils",
     "//mojo/public/interfaces/bindings/tests:test_associated_interfaces",
     "//mojo/public/interfaces/bindings/tests:test_interfaces",
     "//mojo/public/interfaces/bindings/tests:test_interfaces_experimental",
     "//mojo/public/interfaces/bindings/tests:test_struct_traits_interfaces",
     "//testing/gtest",
   ]
 
@@ skipping 76 matching lines @@
 source_set("mojo_public_bindings_test_utils") {
   sources = [
     "validation_test_input_parser.cc",
     "validation_test_input_parser.h",
   ]
 
   deps = [
     "//mojo/public/c/system",
   ]
 }