Add a mojo::RunApplication() for running implementations of ApplicationImplBase.

mojo/public/cpp/application/lib/application_impl_base.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/application_impl_base.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "mojo/public/cpp/application/connection_context.h"
 #include "mojo/public/cpp/application/service_provider_impl.h"
 #include "mojo/public/cpp/environment/logging.h"
 
 namespace mojo {
 
-ApplicationImplBase::ApplicationImplBase() : application_binding_(this) {}
-
 ApplicationImplBase::~ApplicationImplBase() {}
 
 void ApplicationImplBase::Bind(
     InterfaceRequest<Application> application_request) {
   application_binding_.Bind(application_request.Pass());
 }
 
 bool ApplicationImplBase::HasArg(const std::string& arg) const {
   return std::find(args_.begin(), args_.end(), arg) != args_.end();
 }
 
+void ApplicationImplBase::OnInitialize() {}
+
+bool ApplicationImplBase::OnAcceptConnection(
+    ServiceProviderImpl* service_provider_impl) {
+  return false;
+}
+
+void ApplicationImplBase::OnQuit() {}
+
+ApplicationImplBase::ApplicationImplBase() : application_binding_(this) {}
+
 void ApplicationImplBase::Initialize(InterfaceHandle<Shell> shell,
                                      Array<String> args,
                                      const mojo::String& url) {
   shell_ = ShellPtr::Create(std::move(shell));
   shell_.set_connection_error_handler([this]() {
     OnQuit();
     service_provider_impls_.clear();
     Terminate();
   });
   url_ = url;
@@ skipping 20 matching lines @@
     return;
   service_provider_impls_.push_back(std::move(service_provider_impl));
 }
 
 void ApplicationImplBase::RequestQuit() {
   OnQuit();
   Terminate();
 }
 
 }  // namespace mojo