Make launching apps from shelf more intuitive

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

Index: chrome/browser/ui/ash/launcher/launcher_controller_helper.h
diff --git a/chrome/browser/ui/ash/launcher/launcher_controller_helper.h b/chrome/browser/ui/ash/launcher/launcher_controller_helper.h
index 0aa0131675a08f485e9cbd8366cef2b5cbbd1ce8..c22824fe613c772039cc699d6f30909be313487b 100644
--- a/chrome/browser/ui/ash/launcher/launcher_controller_helper.h
+++ b/chrome/browser/ui/ash/launcher/launcher_controller_helper.h
@@ -12,6 +12,7 @@
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "chrome/browser/ui/extensions/extension_enable_flow_delegate.h"
+#include "ui/aura/window.h"
 
 class ArcAppListPrefs;
 class ExtensionEnableFlow;
@@ -43,7 +44,8 @@ class LauncherControllerHelper : public ExtensionEnableFlowDelegate {
 
   void LaunchApp(const ash::ShelfID& id,
                  ash::ShelfLaunchSource source,
-                 int event_flags);
+                 int event_flags,
+                 const aura::Window* root_window);
 
   virtual ArcAppListPrefs* GetArcAppListPrefs() const;