chromeos: fix focus for mushrome

ash/aura/shell_port_classic.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 "ash/aura/shell_port_classic.h"
 
 #include <utility>
 
 #include "ash/accelerators/accelerator_controller.h"
 #include "ash/accelerators/accelerator_controller_delegate_aura.h"
@@ skipping 231 matching lines @@
 void ShellPortClassic::CreatePointerWatcherAdapter() {
   pointer_watcher_adapter_ = base::MakeUnique<PointerWatcherAdapter>();
 }
 
 std::unique_ptr<AshWindowTreeHost> ShellPortClassic::CreateAshWindowTreeHost(
     const AshWindowTreeHostInitParams& init_params) {
   // A return value of null results in falling back to the default.
   return nullptr;
 }
 
+void ShellPortClassic::OnCreatedRootWindowContainers(
+    RootWindowController* root_window_controller) {}
+
 void ShellPortClassic::CreatePrimaryHost() {
   Shell::Get()->window_tree_host_manager()->Start();
   AshWindowTreeHostInitParams ash_init_params;
   Shell::Get()->window_tree_host_manager()->CreatePrimaryHost(ash_init_params);
 }
 
 void ShellPortClassic::InitHosts(const ShellInitParams& init_params) {
   Shell::Get()->window_tree_host_manager()->InitHosts();
 }
 
@@ skipping 19 matching lines @@
   for (auto& observer : display_observers_)
     observer.OnDisplayConfigurationChanging();
 }
 
 void ShellPortClassic::OnDisplayConfigurationChanged() {
   for (auto& observer : display_observers_)
     observer.OnDisplayConfigurationChanged();
 }
 
 }  // namespace ash