Mojo: Add some tests for ChannelEndpointId, etc.

mojo/edk/system/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.
 
 config("system_config") {
   defines = [
     # Ensures that dependent projects import the core functions on Windows.
     "MOJO_USE_SYSTEM_IMPL",
   ]
 }
@@ skipping 12 matching lines @@
     "MOJO_SYSTEM_IMPLEMENTATION",
   ]
 
   all_dependent_configs = [ ":system_config" ]
 
   sources = [
     "channel.cc",
     "channel.h",
     "channel_endpoint.cc",
     "channel_endpoint.h",
+    "channel_endpoint_id.cc",
     "channel_endpoint_id.h",
     "constants.h",
     "core.cc",
     "core.h",
     "data_pipe.cc",
     "data_pipe.h",
     "data_pipe_consumer_dispatcher.cc",
     "data_pipe_consumer_dispatcher.h",
     "data_pipe_producer_dispatcher.cc",
     "data_pipe_producer_dispatcher.h",
@@ skipping 48 matching lines @@
   deps = [
     ":system",
     "//base",
     "//mojo/edk/embedder:embedder_unittests",
     "//mojo/edk/test:test_support",
     "//testing/gtest",
   ]
 
   sources = [
     "../test/multiprocess_test_helper_unittest.cc",
+    "channel_endpoint_id_unittest.cc",
     "channel_unittest.cc",
     "core_test_base.cc",
     "core_test_base.h",
     "core_unittest.cc",
     "data_pipe_unittest.cc",
     "dispatcher_unittest.cc",
     "local_data_pipe_unittest.cc",
     "memory_unittest.cc",
     "message_pipe_dispatcher_unittest.cc",
     "message_pipe_test_utils.cc",
@@ skipping 28 matching lines @@
   ]
 
   sources = [
     "message_pipe_perftest.cc",
     "message_pipe_test_utils.h",
     "message_pipe_test_utils.cc",
     "test_utils.cc",
     "test_utils.h",
   ]
 }