Use active window if on current workspace for fullscreen mode.

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 163 matching lines @@
 
 void MruWindowTracker::SetIgnoreActivations(bool ignore) {
   ignore_window_activations_ = ignore;
 
   // If no longer ignoring window activations, move currently active window
   // to front.
   if (!ignore)
     SetActiveWindow(wm::GetActiveWindow());
 }
 
+const aura::Window* MruWindowTracker::GetMruWindowInRoot(
+    const aura::Window* root_window) {
+  if (ignore_window_activations_) {
+    // While cycling windows, the activated windows list will not track window
+    // activations so as to correctly maintain the most recently used window
+    // order. Despite this, we should still treat the currently active window as
+    // most recently used for the purpose of window management.
+    aura::Window* active_window = wm::GetActiveWindow();
+    if (active_window && active_window->GetRootWindow() == root_window &&
+        IsSwitchableContainer(active_window->parent())) {
+      return active_window;
+    }
+  }
+
+  for (std::list<aura::Window*>::const_iterator iter = mru_windows_.begin();
+       iter != mru_windows_.end(); ++iter) {
+    if ((*iter)->GetRootWindow() == root_window &&
+        IsSwitchableContainer((*iter)->parent()))
+      return *iter;
+  }
+  return NULL;
+}
+
 //////////////////////////////////////////////////////////////////////////////
 // MruWindowTracker, private:
 
 void MruWindowTracker::SetActiveWindow(aura::Window* active_window) {
   if (!active_window)
     return;
 
   std::list<aura::Window*>::iterator iter =
       std::find(mru_windows_.begin(), mru_windows_.end(), active_window);
   // Observe all newly tracked windows.
@@ skipping 16 matching lines @@
 
 void MruWindowTracker::OnWindowDestroyed(aura::Window* window) {
   // It's possible for OnWindowActivated() to be called after
   // OnWindowDestroying(). This means we need to override OnWindowDestroyed()
   // else we may end up with a deleted window in |mru_windows_|.
   mru_windows_.remove(window);
   window->RemoveObserver(this);
 }
 
 }  // namespace ash