Add window overview mode behind --ash-enable-overview-mode flag to F5 key.

ash/wm/window_cycle_controller.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/window_cycle_controller.h"
 
 #include <algorithm>
 
 #include "ash/session_state_delegate.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/activation_controller.h"
 #include "ash/wm/window_cycle_list.h"
+#include "ash/wm/window_selector.h"
 #include "ash/wm/window_util.h"
 #include "ash/wm/workspace_controller.h"
 #include "ui/aura/root_window.h"
 #include "ui/base/events/event.h"
 #include "ui/base/events/event_handler.h"
 
 namespace ash {
 
 namespace {
 
@@ skipping 133 matching lines @@
   // Use the reversed list of windows to prevent a 2-cycle of the most recent
   // windows occurring.
   WindowCycleList cycle_list(BuildWindowList(NULL,true));
   cycle_list.Step(WindowCycleList::FORWARD);
 }
 
 void WindowCycleController::AltKeyReleased() {
   StopCycling();
 }
 
+void WindowCycleController::ToggleOverview() {
+  if (window_selector_.get()) {
+    window_selector_.reset();
+  } else {
+    std::vector<aura::Window*> windows = BuildWindowList(NULL, false);
+    // Don't enter overview mode with no windows.
+    if (windows.empty())
+      return;
+
+    // Deactivating the window will hide popup windows like the omnibar or
+    // open menus.
+    aura::Window* active_window = wm::GetActiveWindow();
+    if (active_window)
+      wm::DeactivateWindow(active_window);
+    window_selector_.reset(new WindowSelector(windows, this));
+  }
+}
+
+void WindowCycleController::SelectWindow(aura::Window* window) {
+  window_selector_.reset();
+  wm::ActivateWindow(window);
+  mru_windows_.remove(window);
+  mru_windows_.push_front(window);
+}
+
 // static
 std::vector<aura::Window*> WindowCycleController::BuildWindowList(
     const std::list<aura::Window*>* mru_windows,
     bool top_most_at_end) {
   WindowCycleList::WindowList windows;
   Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
 
   aura::RootWindow* active_root = Shell::GetActiveRootWindow();
   for (Shell::RootWindowList::const_iterator iter = root_windows.begin();
        iter != root_windows.end(); ++iter) {
@@ skipping 119 matching lines @@
   mru_windows_.remove(window);
   if (window->id() == internal::kShellWindowId_WorkspaceContainer)
     window->RemoveObserver(this);
 }
 
 void WindowCycleController::OnWindowDestroying(aura::Window* window) {
   window->RemoveObserver(this);
 }
 
 }  // namespace ash