[Win] App launcher drag/drop.

ui/app_list/views/app_list_main_view.cc

Index: ui/app_list/views/app_list_main_view.cc
diff --git a/ui/app_list/views/app_list_main_view.cc b/ui/app_list/views/app_list_main_view.cc
index f7a91590784890ee50536f3aa6893a83bc42bfef..d3791ad9c9a5a556b9046efcb325ea13c1cc1be2 100644
--- a/ui/app_list/views/app_list_main_view.cc
+++ b/ui/app_list/views/app_list_main_view.cc
@@ -6,6 +6,8 @@
 
 #include <algorithm>
 
+#include "base/callback.h"
+#include "base/files/file_path.h"
 #include "base/strings/string_util.h"
 #include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/app_list_item_model.h"
@@ -188,6 +190,16 @@ void AppListMainView::ActivateApp(AppListItemModel* item, int event_flags) {
     delegate_->ActivateAppListItem(item, event_flags);
 }
 
+void AppListMainView::GetShortcutPathForApp(
+    const std::string& app_id,
+    const base::Callback<void(const base::FilePath&)>& callback) {
+  if (delegate_) {
+    delegate_->GetShortcutPathForApp(app_id, callback);
+    return;
+  }
+  callback.Run(base::FilePath());
+}
+
 void AppListMainView::QueryChanged(SearchBoxView* sender) {
   base::string16 query;
   TrimWhitespace(model_->search_box()->text(), TRIM_ALL, &query);