Add implementations of mojo::{Run,Terminate}[Main]Application() for "chromium".

mojo/public/cpp/application/lib/run_application.cc

 // Copyright 2016 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.
 
 #include "mojo/public/cpp/application/run_application.h"
 
 #include <assert.h>
 #include <pthread.h>
 
 #include "mojo/public/cpp/application/application_impl_base.h"
 #include "mojo/public/cpp/system/macros.h"
 #include "mojo/public/cpp/system/message_pipe.h"
 #include "mojo/public/cpp/utility/run_loop.h"
 #include "mojo/public/interfaces/application/application.mojom.h"
 
 namespace mojo {
 
 namespace {
 
 // We store a pointer to a |ResultHolder|, which just stores a |MojoResult|, in
 // TLS so that |TerminateApplication()| can provide the result that
 // |RunApplication()| will return. (The |ResultHolder| is just on
 // |RunApplication()|'s stack.)
 struct ResultHolder {
 #ifndef NDEBUG
   bool is_set = false;
 #endif
-  MojoResult result = MOJO_RESULT_UNKNOWN;
+  // TODO(vtl): The default result should probably be |MOJO_RESULT_UNKNOWN|, but
+  // |ApplicationRunner| always returned |MOJO_RESULT_OK|.
+  MojoResult result = MOJO_RESULT_OK;
 };
 
 pthread_key_t g_current_result_holder_key;
 
 // Ensures that we have a TLS slot to store the current result in.
 void InitializeCurrentResultHolderIfNecessary() {
   static pthread_once_t current_result_holder_key_once = PTHREAD_ONCE_INIT;
   int error = pthread_once(&current_result_holder_key_once, []() {
     int error = pthread_key_create(&g_current_result_holder_key, nullptr);
     MOJO_ALLOW_UNUSED_LOCAL(error);
@@ skipping 58 matching lines @@
   ResultHolder* result_holder = GetCurrentResultHolder();
   assert(result_holder);
   assert(!result_holder->is_set);
   result_holder->result = result;
 #ifndef NDEBUG
   result_holder->is_set = true;
 #endif
 }
 
 }  // namespace mojo