cros: Adds ShellPort functions for simplified display mode

ash/display/window_tree_host_manager.cc

 // Copyright (c) 2012 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/display/window_tree_host_manager.h"
 
 #include <algorithm>
 #include <cmath>
 #include <map>
 #include <memory>
@@ skipping 795 matching lines @@
 AshWindowTreeHost* WindowTreeHostManager::AddWindowTreeHostForDisplay(
     const display::Display& display,
     const AshWindowTreeHostInitParams& init_params) {
   static int host_count = 0;
   const display::ManagedDisplayInfo& display_info =
       GetDisplayManager()->GetDisplayInfo(display.id());
   AshWindowTreeHostInitParams params_with_bounds(init_params);
   params_with_bounds.initial_bounds = display_info.bounds_in_native();
   params_with_bounds.offscreen =
       display.id() == display::DisplayManager::kUnifiedDisplayId;
-  AshWindowTreeHost* ash_host = AshWindowTreeHost::Create(params_with_bounds);
+  // The AshWindowTreeHost ends up owned by the RootWindowControllers created
+  // by this class.
+  AshWindowTreeHost* ash_host =
+      AshWindowTreeHost::Create(params_with_bounds).release();
   aura::WindowTreeHost* host = ash_host->AsWindowTreeHost();
   if (!input_method_) {  // Singleton input method instance for Ash.
     input_method_ = ui::CreateInputMethod(this, host->GetAcceleratedWidget());
     // Makes sure the input method is focused by default when created, because
     // Ash uses singleton InputMethod and it won't call OnFocus/OnBlur when the
     // active window changed.
     input_method_->OnFocus();
     input_method_event_handler_.reset(
         new InputMethodEventHandler(input_method_.get()));
   }
@@ skipping 14 matching lines @@
 
   window_tree_hosts_[display.id()] = ash_host;
   SetDisplayPropertiesOnHost(ash_host, display);
 
   if (switches::ConstrainPointerToRoot())
     ash_host->ConfineCursorToRootWindow();
   return ash_host;
 }
 
 }  // namespace ash