Have mojo_shell run in its custom thread on android.

mojo/shell/dbus_service_loader_linux.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/shell/dbus_service_loader_linux.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/location.h"
@@ skipping 98 matching lines @@
             mojo::MessagePipeHandle(
                 service_provider_handle_.release().value())));
   }
 
   // Should the ExternalService disappear completely, destroy connection state.
   // NB: This triggers off of the service disappearing from
   // DBus. Perhaps there's a way to watch at the Mojo layer instead,
   // and that would be superior?
   void HandleNameOwnerChanged(const std::string& old_owner,
                               const std::string& new_owner) {
-    DCHECK(loader_->context_->task_runners()->ui_runner()->
+    DCHECK(loader_->context_->task_runners()->shell_runner()->
            BelongsToCurrentThread());
 
     if (new_owner.empty()) {
-      loader_->context_->task_runners()->ui_runner()->PostTask(
+      loader_->context_->task_runners()->shell_runner()->PostTask(
           FROM_HERE,
           base::Bind(&DBusServiceLoader::ForgetService,
                      base::Unretained(loader_), url_));
     }
   }
 
   DBusServiceLoader* const loader_;
   scoped_refptr<dbus::Bus> bus_;
   dbus::ObjectProxy* service_dbus_proxy_;  // Owned by bus_;
   const GURL url_;
@@ skipping 24 matching lines @@
   url_to_load_context_[url] =
       new LoadContext(this, bus_, url, shell_handle.Pass());
 }
 
 void DBusServiceLoader::OnServiceError(ServiceManager* manager,
                                        const GURL& url) {
   // TODO(cmasone): Anything at all in this method here.
 }
 
 void DBusServiceLoader::ForgetService(const GURL& url) {
-  DCHECK(context_->task_runners()->ui_runner()->BelongsToCurrentThread());
+  DCHECK(context_->task_runners()->shell_runner()->BelongsToCurrentThread());
   DVLOG(2) << "Forgetting service (url: " << url << ")";
 
   LoadContextMap::iterator it = url_to_load_context_.find(url);
   DCHECK(it != url_to_load_context_.end()) << url;
 
   LoadContext* doomed = it->second;
   url_to_load_context_.erase(it);
 
   delete doomed;
 }
 
 }  // namespace shell
 }  // namespace mojo