mash: Migrate wallpaper controllers to ash/common.

ash/mus/bridge/wm_shell_mus.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/mus/bridge/wm_shell_mus.h"
 
 #include <utility>
 
 #include "ash/common/accelerators/accelerator_controller.h"
 #include "ash/common/keyboard/keyboard_ui.h"
@@ skipping 95 matching lines @@
 
 }  // namespace
 
 WmShellMus::WmShellMus(
     std::unique_ptr<ShellDelegate> shell_delegate,
     WindowManager* window_manager,
     views::PointerWatcherEventRouter* pointer_watcher_event_router)
     : WmShell(std::move(shell_delegate)),
       window_manager_(window_manager),
       pointer_watcher_event_router_(pointer_watcher_event_router),
-      session_state_delegate_(new SessionStateDelegateStub) {
+      session_state_delegate_(new SessionStateDelegateStub),
+      blocking_pool_(
+          new base::SequencedWorkerPool(3 /* max_threads */,
+                                        "MashBlocking",
+                                        base::TaskPriority::USER_VISIBLE)) {
   window_tree_client()->AddObserver(this);
   WmShell::Set(this);
 
   uint16_t accelerator_namespace_id = 0u;
   const bool add_result =
       window_manager->GetNextAcceleratorNamespaceId(&accelerator_namespace_id);
   // WmShellMus is created early on, so that this should always succeed.
   DCHECK(add_result);
   accelerator_controller_delegate_.reset(
       new AcceleratorControllerDelegateMus(window_manager_->connector()));
@@ skipping 25 matching lines @@
   DeleteMaximizeModeController();
   DeleteToastManager();
   DeleteSystemTrayDelegate();
   // Has to happen before ~MruWindowTracker.
   DeleteWindowCycleController();
   DeleteWindowSelectorController();
   DeleteMruWindowTracker();
   if (window_tree_client())
     window_tree_client()->RemoveObserver(this);
   WmShell::Set(nullptr);
+
+  // Like BrowserThreadImpl, the goal is to make it impossible for ash to
+  // 'infinite loop' during shutdown, but to reasonably expect that all
+  // BLOCKING_SHUTDOWN tasks queued during shutdown get run. There's nothing
+  // particularly scientific about the number chosen.
+  const int kMaxNewShutdownBlockingTasks = 1000;
+  blocking_pool_->Shutdown(kMaxNewShutdownBlockingTasks);
 }
 
 // static
 WmShellMus* WmShellMus::Get() {
   return static_cast<WmShellMus*>(WmShell::Get());
 }
 
 void WmShellMus::AddRootWindowController(
     WmRootWindowControllerMus* controller) {
   root_window_controllers_.push_back(controller);
@@ skipping 227 matching lines @@
 void WmShellMus::RemovePointerWatcher(views::PointerWatcher* watcher) {
   pointer_watcher_event_router_->RemovePointerWatcher(watcher);
 }
 
 bool WmShellMus::IsTouchDown() {
   // TODO: implement me, http://crbug.com/634967.
   // NOTIMPLEMENTED is too spammy here.
   return false;
 }
 
+base::SequencedWorkerPool* WmShellMus::GetBlockingPool() {
+  return blocking_pool_.get();
+}
+
 #if defined(OS_CHROMEOS)
 void WmShellMus::ToggleIgnoreExternalKeyboard() {
   NOTIMPLEMENTED();
 }
 #endif  // defined(OS_CHROMEOS)
 
 ui::WindowTreeClient* WmShellMus::window_tree_client() {
   return window_manager_->window_tree_client();
 }
 
@@ skipping 18 matching lines @@
                     OnWindowActivated(gained_active, lost_active));
 }
 
 void WmShellMus::OnDidDestroyClient(ui::WindowTreeClient* client) {
   DCHECK_EQ(window_tree_client(), client);
   client->RemoveObserver(this);
 }
 
 }  // namespace mus
 }  // namespace ash