Add panels as a single group of windows per display for overview window cycling.

ash/wm/mru_window_tracker.cc

 // Copyright 2013 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/mru_window_tracker.h"
 
 #include <algorithm>
 
 #include "ash/session_state_delegate.h"
 #include "ash/shell.h"
@@ skipping 72 matching lines @@
   if (!top_most_at_end)
     std::reverse(windows.begin(), windows.end());
 
   return windows;
 }
 
 }  // namespace
 
 const int kSwitchableWindowContainerIds[] = {
   internal::kShellWindowId_DefaultContainer,
-  internal::kShellWindowId_AlwaysOnTopContainer
+  internal::kShellWindowId_AlwaysOnTopContainer,
+  internal::kShellWindowId_PanelContainer
 };
 
 const size_t kSwitchableWindowContainerIdsLength =
     arraysize(kSwitchableWindowContainerIds);
 
 //////////////////////////////////////////////////////////////////////////////
 // MruWindowTracker, public:
 
 MruWindowTracker::MruWindowTracker(
     aura::client::ActivationClient* activation_client)
@@ skipping 72 matching lines @@
 
 void MruWindowTracker::OnWillRemoveWindow(aura::Window* window) {
   mru_windows_.remove(window);
 }
 
 void MruWindowTracker::OnWindowDestroying(aura::Window* window) {
   window->RemoveObserver(this);
 }
 
 }  // namespace ash