Beginnings of Window Modality support.

ui/aura_shell/shell.cc

Index: ui/aura_shell/shell.cc
===================================================================
--- ui/aura_shell/shell.cc	(revision 110305)
+++ ui/aura_shell/shell.cc	(working copy)
@@ -22,6 +22,7 @@
 #include "ui/aura_shell/stacking_controller.h"
 #include "ui/aura_shell/toplevel_layout_manager.h"
 #include "ui/aura_shell/toplevel_window_event_filter.h"
+#include "ui/aura_shell/transient_container_layout_manager.h"
 #include "ui/aura_shell/workspace_controller.h"
 #include "ui/gfx/compositor/layer.h"
 #include "ui/gfx/compositor/layer_animator.h"
@@ -60,6 +61,16 @@
   launcher_container->set_id(internal::kShellWindowId_LauncherContainer);
   containers->push_back(launcher_container);
 
+  aura::Window* transient_container = new aura::Window(NULL);
+  transient_container->SetEventFilter(
+      new ToplevelWindowEventFilter(transient_container));
+  transient_container->SetLayoutManager(
+      new internal::TransientContainerLayoutManager(transient_container));
+  transient_container->set_id(internal::kShellWindowId_TransientContainer);
+  containers->push_back(transient_container);
+
+  // TODO(beng): Figure out if we can make this use ModalityEventFilter instead
+  //             of stops_event_propagation.
   aura::Window* lock_container = new aura::Window(NULL);
   lock_container->set_stops_event_propagation(true);
   lock_container->set_id(internal::kShellWindowId_LockScreenContainer);
@@ -180,6 +191,16 @@
   return aura::Desktop::GetInstance()->GetChildById(container_id);
 }
 
+void Shell::AddDesktopEventFilter(aura::EventFilter* filter) {
+  static_cast<internal::DesktopEventFilter*>(
+      aura::Desktop::GetInstance()->event_filter())->AddFilter(filter);
+}
+
+void Shell::RemoveDesktopEventFilter(aura::EventFilter* filter) {
+  static_cast<internal::DesktopEventFilter*>(
+      aura::Desktop::GetInstance()->event_filter())->RemoveFilter(filter);
+}
+
 void Shell::ToggleOverview() {
   if (workspace_controller_.get())
     workspace_controller_->ToggleOverview();