Revert of Remove remote tree host and some related input and metro_driver code

chrome/browser/ui/ash/launcher/chrome_launcher_controller.h

Index: chrome/browser/ui/ash/launcher/chrome_launcher_controller.h
diff --git a/chrome/browser/ui/ash/launcher/chrome_launcher_controller.h b/chrome/browser/ui/ash/launcher/chrome_launcher_controller.h
index e63fa2f4479aee4718f88c90025be0e8e5116b4b..9315d5bab8428de1bc484bdc3134d29224132312 100644
--- a/chrome/browser/ui/ash/launcher/chrome_launcher_controller.h
+++ b/chrome/browser/ui/ash/launcher/chrome_launcher_controller.h
@@ -551,6 +551,11 @@
   // Forget the current profile to allow attaching to a new one.
   void ReleaseProfile();
 
+  // Returns true if |app_id| is a Packaged App that has already launched on the
+  // native desktop and, if so, executes it as a desktop shortcut to activate
+  // desktop mode and send another OnLaunched event to the Extension.
+  bool LaunchedInNativeDesktop(const std::string& app_id);
+
   static ChromeLauncherController* instance_;
 
   ash::ShelfModel* model_;