Make launching apps from shelf more intuitive

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

Index: chrome/browser/ui/ash/launcher/chrome_launcher_controller.cc
diff --git a/chrome/browser/ui/ash/launcher/chrome_launcher_controller.cc b/chrome/browser/ui/ash/launcher/chrome_launcher_controller.cc
index 8bbc8df797f0d402386f096c4c187d93a47ed680..828de77949713a19909971b0e73acbbbbcc8b193 100644
--- a/chrome/browser/ui/ash/launcher/chrome_launcher_controller.cc
+++ b/chrome/browser/ui/ash/launcher/chrome_launcher_controller.cc
@@ -368,10 +368,6 @@ void ChromeLauncherController::SetV1AppStatus(const std::string& app_id,
   }
 }
 
-void ChromeLauncherController::Launch(const ash::ShelfID& id, int event_flags) {
-  LaunchApp(id, ash::LAUNCH_FROM_UNKNOWN, event_flags);
-}
-
 void ChromeLauncherController::Close(const ash::ShelfID& id) {
   ash::ShelfItemDelegate* delegate = model_->GetShelfItemDelegate(id);
   if (!delegate)
@@ -394,8 +390,9 @@ bool ChromeLauncherController::IsPlatformApp(const ash::ShelfID& id) {
 
 void ChromeLauncherController::LaunchApp(const ash::ShelfID& id,
                                          ash::ShelfLaunchSource source,
-                                         int event_flags) {
-  launcher_controller_helper_->LaunchApp(id, source, event_flags);
+                                         int event_flags,
+                                         const aura::Window* root_window) {
+  launcher_controller_helper_->LaunchApp(id, source, event_flags, root_window);
 }
 
 void ChromeLauncherController::ActivateApp(const std::string& app_id,
@@ -415,7 +412,7 @@ void ChromeLauncherController::ActivateApp(const std::string& app_id,
   if (!item_delegate->GetRunningApplications().empty())
     SelectItemWithSource(item_delegate.get(), source);
   else
-    LaunchApp(shelf_id, source, event_flags);
+    LaunchApp(shelf_id, source, event_flags, NULL);

[stevenjb, 2017/05/22 17:55:29]

nullptr /* root_window */

 }
 
 void ChromeLauncherController::SetLauncherItemImage(