Implement workspace scrubbing

ash/wm/workspace/workspace_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/wm/workspace/workspace_manager.h"
 
 #include <algorithm>
 #include <functional>
 
 #include "ash/root_window_controller.h"
@@ skipping 244 matching lines @@
     pending_workspaces_.insert(workspace);
     return workspace->window();
   }
 
   if (!GetTrackedByWorkspace(window) || GetPersistsAcrossAllWorkspaces(window))
     return active_workspace_->window();
 
   return desktop_workspace()->window();
 }
 
+bool WorkspaceManager::CycleToWorkspace(CycleDirection direction) {
+  aura::Window* active_window = wm::GetActiveWindow();
+  if (!active_workspace_->window()->Contains(active_window))
+    active_window = NULL;
+
+  Workspaces::const_iterator workspace_i(FindWorkspace(active_workspace_));
+  int workspace_offset = 0;
+  if (direction == CYCLE_PREVIOUS) {
+    workspace_offset = 1;
+    if (workspace_i == workspaces_.end() - 1)
+      return false;
+  } else {
+    workspace_offset = -1;
+    if (workspace_i == workspaces_.begin())
+      return false;
+  }
+
+  Workspaces::const_iterator next_workspace_i(workspace_i + workspace_offset);
+  SetActiveWorkspace(*next_workspace_i, SWITCH_OTHER, base::TimeDelta());
+
+  // The activation controller will pick a window from the just activated
+  // workspace to activate as a result of DeactivateWindow().
+  if (active_window)
+    wm::DeactivateWindow(active_window);
+  return true;
+}
+
 void WorkspaceManager::DoInitialAnimation() {
   if (active_workspace_->is_maximized()) {
     RootWindowController* root_controller = GetRootWindowController(
         contents_view_->GetRootWindow());
     if (root_controller) {
       aura::Window* background = root_controller->GetContainer(
           kShellWindowId_DesktopBackgroundContainer);
       background->Show();
       ShowOrHideDesktopBackground(background, SWITCH_INITIAL,
                                   base::TimeDelta(), false);
@@ skipping 458 matching lines @@
     new_workspace->window()->Show();
   ReparentWindow(window, new_workspace->window(), NULL);
   if (is_active) {
     SetActiveWorkspace(new_workspace, SWITCH_TRACKED_BY_WORKSPACE_CHANGED,
                        base::TimeDelta());
   }
 }
 
 }  // namespace internal
 }  // namespace ash