Refactor most recently used window tracking into a separate class.

ash/shelf/shelf_layout_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/shelf/shelf_layout_manager.h"
 
 #include <algorithm>
 #include <cmath>
 #include <cstring>
 #include <string>
 #include <vector>
 
 #include "ash/ash_switches.h"
 #include "ash/launcher/launcher.h"
 #include "ash/launcher/launcher_types.h"
 #include "ash/root_window_controller.h"
 #include "ash/screen_ash.h"
 #include "ash/session_state_delegate.h"
 #include "ash/shelf/shelf_bezel_event_filter.h"
 #include "ash/shelf/shelf_layout_manager_observer.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/system/status_area_widget.h"
 #include "ash/wm/gestures/shelf_gesture_handler.h"
+#include "ash/wm/mru_window_tracker.h"
 #include "ash/wm/property_util.h"
-#include "ash/wm/window_cycle_controller.h"
 #include "ash/wm/window_properties.h"
 #include "ash/wm/window_util.h"
 #include "ash/wm/workspace/workspace_animations.h"
 #include "ash/wm/workspace_controller.h"
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/command_line.h"
 #include "base/i18n/rtl.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
@@ skipping 895 matching lines @@
                        alignment_ == SHELF_ALIGNMENT_LEFT ?
                            -kNotificationBubbleGapHeight : 0,
                        alignment_ == SHELF_ALIGNMENT_TOP ?
                            -kNotificationBubbleGapHeight : 0);
   }
 
   if (shelf_region.Contains(Shell::GetScreen()->GetCursorScreenPoint()))
     return SHELF_AUTO_HIDE_SHOWN;
 
   const std::vector<aura::Window*> windows =
-      ash::WindowCycleController::BuildWindowList(NULL, false);
+      ash::MruWindowTracker::BuildWindowList(false);
 
   // Process the window list and check if there are any visible windows.
   for (size_t i = 0; i < windows.size(); ++i) {
     if (windows[i] && windows[i]->IsVisible() &&
         !ash::wm::IsWindowMinimized(windows[i]) &&
         root_window_ == windows[i]->GetRootWindow())
       return SHELF_AUTO_HIDE_HIDDEN;
   }
 
   // If there are no visible windows do not hide the shelf.
@@ skipping 66 matching lines @@
       return gfx::Insets(0, distance, 0, 0);
     case SHELF_ALIGNMENT_TOP:
       return gfx::Insets(0, 0, distance, 0);
   }
   NOTREACHED();
   return gfx::Insets();
 }
 
 }  // namespace internal
 }  // namespace ash