Add kApplicationIdKey for ShellSurface::GetApplicationId and SetApplicationId

chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.cc

Index: chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.cc
diff --git a/chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.cc b/chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.cc
index 1c03c77232922926989008947daa7f1b8dd54c3b..4094ecd7dfb30d2d50ef6749dc2bad1754d4eb91 100644
--- a/chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.cc
+++ b/chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.cc
@@ -711,12 +711,12 @@ void ArcAppWindowLauncherController::SetOrientationLockForAppWindow(
 
 // static
 int ArcAppWindowLauncherController::GetWindowTaskId(aura::Window* window) {
-  const std::string arc_app_id = exo::ShellSurface::GetApplicationId(window);
-  if (arc_app_id.empty())
+  const std::string* arc_app_id = exo::ShellSurface::GetApplicationId(window);
+  if (!arc_app_id)
     return -1;
 
   int task_id = -1;
-  if (sscanf(arc_app_id.c_str(), "org.chromium.arc.%d", &task_id) != 1)
+  if (sscanf(arc_app_id->c_str(), "org.chromium.arc.%d", &task_id) != 1)
     return -1;
 
   return task_id;