Adding functions to the window_list_provider for accessing the activities window list

athena/wm/window_manager_impl.cc

 // Copyright 2014 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 "athena/wm/window_manager_impl.h"
 
 #include <algorithm>
 
 #include "athena/screen/public/screen_manager.h"
 #include "athena/util/container_priorities.h"
@@ skipping 166 matching lines @@
 void WindowManagerImpl::SetInOverview(bool active) {
   bool in_overview = !!overview_;
   if (active == in_overview)
     return;
 
   bezel_controller_->set_left_right_delegate(
       active ? NULL : split_view_controller_.get());
   if (active) {
     FOR_EACH_OBSERVER(WindowManagerObserver, observers_, OnOverviewModeEnter());
 
-    // Re-stack all windows in the order defined by window_list_provider_.
-    aura::Window::Windows window_list = window_list_provider_->GetWindowList();
-    aura::Window::Windows::iterator it;
-    for (it = window_list.begin(); it != window_list.end(); ++it)
-      container_->StackChildAtTop(*it);
+    // Note: The window_list_provider_ resembles the exact window list of the
+    // container, so no re-stacking is required before showing the OverviewMode.
     overview_ = WindowOverviewMode::Create(
         container_.get(), window_list_provider_.get(),
         split_view_controller_.get(), this);
   } else {
     overview_.reset();
     FOR_EACH_OBSERVER(WindowManagerObserver, observers_, OnOverviewModeExit());
   }
 }
 
 void WindowManagerImpl::InstallAccelerators() {
@@ skipping 12 matching lines @@
 }
 
 void WindowManagerImpl::RemoveObserver(WindowManagerObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 void WindowManagerImpl::ToggleSplitViewForTest() {
   ToggleSplitview();
 }
 
+WindowListProvider* WindowManagerImpl::GetWindowListProvider() {
+  return window_list_provider_.get();
+}
+
 void WindowManagerImpl::OnSelectWindow(aura::Window* window) {
   if (split_view_controller_->IsSplitViewModeActive()) {
     split_view_controller_->DeactivateSplitMode();
     FOR_EACH_OBSERVER(WindowManagerObserver, observers_, OnSplitViewModeExit());
   }
   wm::ActivateWindow(window);
   SetInOverview(false);
   // If |window| does not have the size of the work-area, then make sure it is
   // resized.
   const gfx::Size work_area =
@@ skipping 167 matching lines @@
   DCHECK(!instance);
 }
 
 // static
 WindowManager* WindowManager::GetInstance() {
   DCHECK(instance);
   return instance;
 }
 
 }  // namespace athena