Implement workspace scrubbing

ash/wm/workspace/workspace_manager.h

 // 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.
 
 #ifndef ASH_WM_WORKSPACE_WORKSPACE_MANAGER_H_
 #define ASH_WM_WORKSPACE_WORKSPACE_MANAGER_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 35 matching lines @@
 class Workspace;
 
 // WorkspaceManager manages multiple workspaces in the desktop. Workspaces are
 // implicitly created as windows are maximized (or made fullscreen), and
 // destroyed when maximized windows are closed or restored. There is always one
 // workspace for the desktop.
 // Internally WorkspaceManager creates a Window for each Workspace. As windows
 // are maximized and restored they are reparented to the right Window.
 class ASH_EXPORT WorkspaceManager : public ash::ShellObserver {
  public:
+  enum CycleDirection {
+    CYCLE_NEXT,
+    CYCLE_PREVIOUS
+  };
+
   explicit WorkspaceManager(aura::Window* viewport);
   virtual ~WorkspaceManager();
 
   // Returns true if |window| is considered maximized and should exist in its
   // own workspace.
   static bool IsMaximized(aura::Window* window);
   static bool IsMaximizedState(ui::WindowShowState state);
 
   // Returns true if |window| is minimized and will restore to a maximized
   // window.
   static bool WillRestoreMaximized(aura::Window* window);
 
   // Returns the current window state.
   WorkspaceWindowState GetWindowState() const;
 
   void SetShelf(ShelfLayoutManager* shelf);
 
   // Activates the workspace containing |window|. Does nothing if |window| is
   // NULL or not contained in a workspace.
   void SetActiveWorkspaceByWindow(aura::Window* window);
 
   // Returns the parent for |window|. This is invoked from StackingController
   // when a new Window is being added.
   aura::Window* GetParentForNewWindow(aura::Window* window);
 
+  // Called by the workspace cycler to activate the next workspace in
+  // |direction|. Returns false if there are no more workspaces to cycle
+  // to in |direction|.
+  bool CycleToWorkspace(CycleDirection direction);
+
   // Starts the animation that occurs on first login.
   void DoInitialAnimation();
 
   // ShellObserver overrides:
   virtual void OnAppTerminating() OVERRIDE;
 
  private:
   friend class WorkspaceLayoutManager;
   friend class WorkspaceManagerTest;
 
@@ skipping 159 matching lines @@
   // DesktopBackgroundFadeController.
   bool creating_fade_;
 
   DISALLOW_COPY_AND_ASSIGN(WorkspaceManager);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_WORKSPACE_WORKSPACE_MANAGER_H_