Making Mandoline apps notice when all the objects they vended are gone so that it can terminate.

mojo/runner/android/native_viewport_application_loader.cc

 // 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.
 
 #include "mojo/runner/android/native_viewport_application_loader.h"
 
 #include "components/gles2/gpu_state.h"
 #include "components/native_viewport/native_viewport_impl.h"
 #include "mojo/application/public/cpp/application_impl.h"
 
@@ skipping 18 matching lines @@
   connection->AddService<NativeViewport>(this);
   connection->AddService<Gpu>(this);
   return true;
 }
 
 void NativeViewportApplicationLoader::Create(
     ApplicationConnection* connection,
     InterfaceRequest<NativeViewport> request) {
   if (!gpu_state_)
     gpu_state_ = new gles2::GpuState;
-  new native_viewport::NativeViewportImpl(false, gpu_state_, request.Pass());
+  // Pass a null AppRefCount because on Android the NativeViewPort app must
+  // live on the main thread and we don't want to exit that when all the native
+  // viewports are gone.
+  new native_viewport::NativeViewportImpl(
+      false, gpu_state_, request.Pass(),
+      make_scoped_ptr<mojo::AppRefCount>(nullptr));
 }
 
 void NativeViewportApplicationLoader::Create(ApplicationConnection* connection,
                                              InterfaceRequest<Gpu> request) {
   if (!gpu_state_)
     gpu_state_ = new gles2::GpuState;
   new gles2::GpuImpl(request.Pass(), gpu_state_);
 }
 
 }  // namespace runner
 }  // namespace mojo