Ignore fullscreen windows which are behind other windows for fullscreen mode.

ash/wm/overview/window_selector_controller.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/overview/window_selector_controller.h"
 
 #include "ash/root_window_controller.h"
 #include "ash/session_state_delegate.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
@@ skipping 54 matching lines @@
   }
   window_selector_->Step(direction);
 }
 
 bool WindowSelectorController::IsSelecting() {
   return window_selector_.get() != NULL;
 }
 
 void WindowSelectorController::OnWindowSelected(aura::Window* window) {
   window_selector_.reset();
-
-  // If there is a fullscreen window on this display and it was not selected
-  // it should exit fullscreen mode.

[oshima, 2013/12/03 19:04:57]

is it difficult to keep it fullscreen? It'd be nice if I can pick non fullscreen
window while I have fullscreen on the back.

[flackr, 2013/12/03 19:08:25]

That's what the code will do after this change. The window will still be
fullscreen but behind the newly activated window.

-  internal::RootWindowController* controller =
-      internal::GetRootWindowController(window->GetRootWindow());
-  aura::Window* fullscreen_window = NULL;
-  if (controller)
-    fullscreen_window = controller->GetTopmostFullscreenWindow();
-  if (fullscreen_window && fullscreen_window != window) {
-    wm::GetWindowState(fullscreen_window)->ToggleFullscreen();
-  }
-
   wm::ActivateWindow(window);
   last_selection_time_ = base::Time::Now();
   Shell::GetInstance()->mru_window_tracker()->SetIgnoreActivations(false);
 }
 
 void WindowSelectorController::OnSelectionCanceled() {
   window_selector_.reset();
   last_selection_time_ = base::Time::Now();
   Shell::GetInstance()->mru_window_tracker()->SetIgnoreActivations(false);
 }
 
 void WindowSelectorController::OnSelectionStarted() {
   Shell::GetInstance()->mru_window_tracker()->SetIgnoreActivations(true);
   Shell* shell = Shell::GetInstance();
   shell->delegate()->RecordUserMetricsAction(UMA_WINDOW_SELECTION);
   if (!last_selection_time_.is_null()) {
     UMA_HISTOGRAM_LONG_TIMES(
         "Ash.WindowSelector.TimeBetweenUse",
         base::Time::Now() - last_selection_time_);
   }
 }
 
 }  // namespace ash