Add option to install an ephemeral app to ChromeOS shelf context menu

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

Index: chrome/browser/ui/ash/launcher/app_window_launcher_item_controller.cc
diff --git a/chrome/browser/ui/ash/launcher/app_window_launcher_item_controller.cc b/chrome/browser/ui/ash/launcher/app_window_launcher_item_controller.cc
index 14d80ecafdd11bacf235fe449a7c0d1b8fffed59..0dc11a78bbbf724e0792d4f36bf25f851ee2a123 100644
--- a/chrome/browser/ui/ash/launcher/app_window_launcher_item_controller.cc
+++ b/chrome/browser/ui/ash/launcher/app_window_launcher_item_controller.cc
@@ -9,6 +9,7 @@
 #include "ash/shelf/shelf_model.h"
 #include "ash/wm/window_state.h"
 #include "ash/wm/window_util.h"
+#include "chrome/browser/extensions/webstore_install_prompt.h"
 #include "chrome/browser/ui/ash/launcher/chrome_launcher_app_menu_item.h"
 #include "chrome/browser/ui/ash/launcher/chrome_launcher_app_menu_item_v2app.h"
 #include "chrome/browser/ui/ash/launcher/chrome_launcher_controller.h"
@@ -151,6 +152,18 @@ void AppWindowLauncherItemController::ActivateIndexedApp(size_t index) {
   ShowAndActivateOrMinimize(*it);
 }
 
+void AppWindowLauncherItemController::InstallApp() {
+  AppWindow* parent_window =
+      last_active_app_window_ ? last_active_app_window_ : app_windows_.back();
+  scoped_refptr<extensions::WebstoreInstallPrompt> installer =
+      new extensions::WebstoreInstallPrompt(
+          app_id(),
+          launcher_controller()->profile(),
+          parent_window ? parent_window->GetNativeWindow() : NULL,
+          extensions::WebstoreInstallPrompt::Callback());
+  installer->BeginInstall();
+}
+
 ChromeLauncherAppMenuItems AppWindowLauncherItemController::GetApplicationList(
     int event_flags) {
   ChromeLauncherAppMenuItems items;