Wires up immersive mode for chrome and mash

ash/mus/bridge/wm_shell_mus.cc

Index: ash/mus/bridge/wm_shell_mus.cc
diff --git a/ash/mus/bridge/wm_shell_mus.cc b/ash/mus/bridge/wm_shell_mus.cc
index e2eb353e1b57e430b3afc5446e339fd99e6daf00..2435c7ad2106e7194613ef20b373296d935b454f 100644
--- a/ash/mus/bridge/wm_shell_mus.cc
+++ b/ash/mus/bridge/wm_shell_mus.cc
@@ -22,6 +22,7 @@
 #include "ash/common/wm_activation_observer.h"
 #include "ash/mus/accelerators/accelerator_controller_delegate_mus.h"
 #include "ash/mus/accelerators/accelerator_controller_registrar.h"
+#include "ash/mus/bridge/immersive_handler_factory_mus.h"
 #include "ash/mus/bridge/wm_root_window_controller_mus.h"
 #include "ash/mus/bridge/wm_window_mus.h"
 #include "ash/mus/container_ids.h"
@@ -125,6 +126,7 @@ WmShellMus::WmShellMus(
   SetAcceleratorController(base::MakeUnique<AcceleratorController>(
       accelerator_controller_delegate_.get(),
       accelerator_controller_registrar_.get()));
+  immersive_handler_factory_.reset(new ImmersiveHandlerFactoryMus);
 
   CreateMaximizeModeController();
 
@@ -340,8 +342,7 @@ WmShellMus::CreateScopedDisableInternalMouseAndKeyboard() {
 
 std::unique_ptr<ImmersiveFullscreenController>
 WmShellMus::CreateImmersiveFullscreenController() {
-  // TODO(sky): port ImmersiveFullscreenController, http://crbug.com/548435.
-  return nullptr;
+  return base::MakeUnique<ImmersiveFullscreenController>();
 }
 
 void WmShellMus::OnOverviewModeStarting() {