Implement "pinned" mode in ash.

ash/shell.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/shell.h"
 
 #include <algorithm>
 #include <string>
 #include <utility>
 
@@ skipping 57 matching lines @@
 #include "ash/utility/screenshot_controller.h"
 #include "ash/wm/ash_focus_rules.h"
 #include "ash/wm/ash_native_cursor_manager.h"
 #include "ash/wm/event_client_impl.h"
 #include "ash/wm/lock_state_controller.h"
 #include "ash/wm/maximize_mode/maximize_mode_controller.h"
 #include "ash/wm/maximize_mode/maximize_mode_window_manager.h"
 #include "ash/wm/overlay_event_filter.h"
 #include "ash/wm/overview/scoped_overview_animation_settings_factory_aura.h"
 #include "ash/wm/overview/window_selector_controller.h"
+#include "ash/wm/pinned_controller.h"
 #include "ash/wm/power_button_controller.h"
 #include "ash/wm/resize_shadow_controller.h"
 #include "ash/wm/system_gesture_event_filter.h"
 #include "ash/wm/system_modal_container_event_filter.h"
 #include "ash/wm/system_modal_container_layout_manager.h"
 #include "ash/wm/toplevel_window_event_handler.h"
 #include "ash/wm/video_detector.h"
 #include "ash/wm/window_animations.h"
 #include "ash/wm/window_cycle_controller.h"
 #include "ash/wm/window_properties.h"
@@ skipping 696 matching lines @@
   visibility_controller_.reset();
   // |shelf_item_delegate_manager_| observes |shelf_model_|. It must be
   // destroyed before |shelf_model_| is destroyed.
   shelf_item_delegate_manager_.reset();
   shelf_model_.reset();
 
   power_button_controller_.reset();
   lock_state_controller_.reset();
 
 #if defined(OS_CHROMEOS)
+  window_tree_host_manager_->RemoveObserver(pinned_controller_.get());
+  wm_shell_common_->RemoveShellObserver(pinned_controller_.get());
+  pinned_controller_.reset();
+#endif
+
+#if defined(OS_CHROMEOS)
   resolution_notification_controller_.reset();
 #endif
   desktop_background_controller_.reset();
   screenshot_controller_.reset();
   mouse_cursor_filter_.reset();
 
 #if defined(OS_CHROMEOS)
   touch_transformer_controller_.reset();
 #endif  // defined(OS_CHROMEOS)
 
@@ skipping 204 matching lines @@
       new ToplevelWindowEventHandler(wm_shell_.get()));
 
   system_gesture_filter_.reset(new SystemGestureEventFilter);
   AddPreTargetHandler(system_gesture_filter_.get());
 
   keyboard_metrics_filter_.reset(new KeyboardUMAEventFilter);
   AddPreTargetHandler(keyboard_metrics_filter_.get());
 
 #if defined(OS_CHROMEOS)
   sticky_keys_controller_.reset(new StickyKeysController);
+  pinned_controller_.reset(new wm::PinnedController);
+  wm_shell_common_->AddShellObserver(pinned_controller_.get());
+  window_tree_host_manager_->AddObserver(pinned_controller_.get());
 #endif
 
   lock_state_controller_.reset(new LockStateController);
   power_button_controller_.reset(new PowerButtonController(
       lock_state_controller_.get()));
 #if defined(OS_CHROMEOS)
   // Pass the initial display state to PowerButtonController.
   power_button_controller_->OnDisplayModeChanged(
       display_configurator_->cached_displays());
 #endif
@@ skipping 215 matching lines @@
 
 void Shell::OnWindowActivated(
     aura::client::ActivationChangeObserver::ActivationReason reason,
     aura::Window* gained_active,
     aura::Window* lost_active) {
   if (gained_active)
     target_root_window_ = gained_active->GetRootWindow();
 }
 
 }  // namespace ash