Reify view ownership as a message pipe.

examples/ui/tile/tile_app.cc

 // Copyright 2015 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 <vector>
 
 #include "base/strings/string_split.h"
 #include "examples/ui/tile/tile_app.h"
 #include "examples/ui/tile/tile_view.h"
 #include "url/gurl.h"
 
 namespace examples {
 
 TileApp::TileApp() {}
 
 TileApp::~TileApp() {}
 
-bool TileApp::CreateView(
+void TileApp::CreateView(
     const std::string& connection_url,
+    mojo::InterfaceRequest<mojo::ui::ViewOwner> view_owner_request,
     mojo::InterfaceRequest<mojo::ServiceProvider> services,
-    mojo::ServiceProviderPtr exposed_services,
-    const mojo::ui::ViewProvider::CreateViewCallback& callback) {
+    mojo::ServiceProviderPtr exposed_services) {
   GURL url(connection_url);
   std::vector<std::string> view_urls;
   base::SplitString(url.query(), ',', &view_urls);
 
   if (view_urls.empty()) {
     LOG(ERROR) << "Must supply comma-delimited URLs of mojo views to tile as a "
                   "query parameter.";
-    return false;
+    return;
   }
 
-  new TileView(app_impl(), view_urls, callback);
-  return true;
+  new TileView(app_impl(), view_owner_request.Pass(), view_urls);
 }
 
 }  // namespace examples