ash/immersive mode: Hide the launcher when entering immersive mode

ash/wm/workspace_controller.cc

Index: ash/wm/workspace_controller.cc
diff --git a/ash/wm/workspace_controller.cc b/ash/wm/workspace_controller.cc
index 3ca70d6749c4a02a4f5a72acda85f5c754225048..93099f93592c7b457e5039369ceb4db141c5da8f 100644
--- a/ash/wm/workspace_controller.cc
+++ b/ash/wm/workspace_controller.cc
@@ -46,11 +46,14 @@ void WorkspaceController::SetActiveWorkspaceByWindow(aura::Window* window) {
   return workspace_manager_->SetActiveWorkspaceByWindow(window);
 }
 
+aura::Window* WorkspaceController::GetActiveWorkspaceWindow() {
+  return workspace_manager_->GetActiveWorkspaceWindow();
+}
+
 aura::Window* WorkspaceController::GetParentForNewWindow(aura::Window* window) {
   return workspace_manager_->GetParentForNewWindow(window);
 }
 
-
 void WorkspaceController::DoInitialAnimation() {
   workspace_manager_->DoInitialAnimation();
 }