Use mojo SystemTray interfaces for both mash and classic ash

ash/mus/window_manager.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 "ash/mus/window_manager.h"
 
 #include <stdint.h>
 
 #include <utility>
 
@@ skipping 58 matching lines @@
       ui::mojom::FrameDecorationValues::New();
   const gfx::Insets client_area_insets =
       NonClientFrameController::GetPreferredClientAreaInsets();
   frame_decoration_values->normal_client_area_insets = client_area_insets;
   frame_decoration_values->maximized_client_area_insets = client_area_insets;
   frame_decoration_values->max_title_bar_button_width =
       NonClientFrameController::GetMaxTitleBarButtonWidth();
   window_manager_client_->SetFrameDecorationValues(
       std::move(frame_decoration_values));
 
   shell_.reset(new WmShellMus(base::MakeUnique<ShellDelegateMus>(connector_),

[msw, 2016/09/30 23:26:49]

q: Would it make sense for the shell delegate to provide an accessor to its
connector, since it's the owner? Then shell init can just access it that way.
It's no big deal either way, especially if that complicates ash::Shell init.

                               this, pointer_watcher_event_router_.get()));
-  shell_->Initialize(blocking_pool);
+  shell_->Initialize(blocking_pool, connector_);
   lookup_.reset(new WmLookupMus);
 }
 
 void WindowManager::SetScreenLocked(bool is_locked) {
   // TODO: screen locked state needs to be persisted for newly added displays.
   for (auto& root_window_controller : root_window_controllers_) {
     WmWindowMus* non_lock_screen_containers_container =
         root_window_controller->GetWindowByShellWindowId(
             kShellWindowId_NonLockScreenContainersContainer);
     non_lock_screen_containers_container->mus_window()->SetVisible(!is_locked);
@@ skipping 266 matching lines @@
                                                     const ui::Event& event) {
   auto iter = accelerator_handlers_.find(GetAcceleratorNamespaceId(id));
   if (iter == accelerator_handlers_.end())
     return ui::mojom::EventResult::HANDLED;
 
   return iter->second->OnAccelerator(id, event);
 }
 
 }  // namespace mus
 }  // namespace ash