Make launching apps from shelf more intuitive

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 82b7199f20498fa4f9c4d22c15682dfa14ffc177..daa144ceff41a7d3bcd0d3a282b526dff475c693 100644
--- a/chrome/browser/ui/ash/launcher/chrome_launcher_controller.h
+++ b/chrome/browser/ui/ash/launcher/chrome_launcher_controller.h
@@ -26,6 +26,7 @@
 #include "components/prefs/pref_change_registrar.h"
 #include "components/sync_preferences/pref_service_syncable_observer.h"
 #include "mojo/public/cpp/bindings/associated_binding.h"
+#include "ui/aura/window.h"
 
 class AccountId;
 class AppIconLoader;
@@ -120,11 +121,6 @@ class ChromeLauncherController
   // Adds or removes an item as needed to respect the running and pinned state.
   void SetV1AppStatus(const std::string& app_id, ash::ShelfItemStatus status);
 
-  // Requests that the shelf item controller specified by |id| open a new
-  // instance of the app.  |event_flags| holds the flags of the event which
-  // triggered this command.
-  void Launch(const ash::ShelfID& id, int event_flags);
-
   // Closes the specified item.
   void Close(const ash::ShelfID& id);
 
@@ -135,10 +131,12 @@ class ChromeLauncherController
   bool IsPlatformApp(const ash::ShelfID& id);
 
   // Opens a new instance of the application identified by the ShelfID.
-  // Used by the app-list, and by pinned-app shelf items.
+  // Used by the app-list, and by pinned-app shelf items. |root_window| is the
+  // root window from which the app is launched.
   void LaunchApp(const ash::ShelfID& id,
                  ash::ShelfLaunchSource source,
-                 int event_flags);
+                 int event_flags,
+                 const aura::Window* root_window);
 
   // If |app_id| is running, reactivates the app's most recently active window,
   // otherwise launches and activates the app.