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,

[Mr4D (OOO till 08-26), 2014/05/28 15:42:15]

I am not quite sure that I understand why you need this window. It feels like
that you are using a "random" window as a parent (which might even be hidden).
You might therefore be better off to use e.g. the shelf's window instead?

[tmdiep, 2014/05/28 23:22:20]

The purpose of the window is for positioning the install dialog. Ideally, I
would use the foreground window of the app. If there is no visible window, we
can just pass in NULL for the parent and it will center the dialog on the
screen.

Good point about hidden windows; I'll refactor the parent window selection.

+          extensions::WebstoreInstallPrompt::Callback());
+  installer->BeginInstall();
+}
+
 ChromeLauncherAppMenuItems AppWindowLauncherItemController::GetApplicationList(
     int event_flags) {
   ChromeLauncherAppMenuItems items;