Make application shortcuts point to app_host.exe, install App Host during app installation.

chrome/browser/extensions/app_shortcut_manager.cc

Index: chrome/browser/extensions/app_shortcut_manager.cc
diff --git a/chrome/browser/extensions/app_shortcut_manager.cc b/chrome/browser/extensions/app_shortcut_manager.cc
index 7d1f275403cd833be7008724a10510d3192e9fde..c15f74b79613bca64a4f0bccccc9cf7ab843f266 100644
--- a/chrome/browser/extensions/app_shortcut_manager.cc
+++ b/chrome/browser/extensions/app_shortcut_manager.cc
@@ -4,8 +4,10 @@
 
 #include "chrome/browser/extensions/app_shortcut_manager.h"
 
+#include "base/bind.h"
 #include "base/command_line.h"
 #include "base/utf_string_conversions.h"
+#include "chrome/browser/extensions/app_host_installer.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/web_applications/web_app.h"
 #include "chrome/common/chrome_notification_types.h"
@@ -99,6 +101,18 @@ void AppShortcutManager::Observe(int type,
 
 void AppShortcutManager::UpdateApplicationShortcuts(
     const Extension* extension) {
+  app_host_installer::InstallAppHostIfNecessary(
+      *extension, base::Bind(&AppShortcutManager::OnAppHostInstallationComplete,
+                             base::Unretained(this), extension));
+}
+
+void AppShortcutManager::OnAppHostInstallationComplete(
+    const Extension* extension, bool app_host_install_success) {
+  if (!app_host_install_success) {
+    // Do not create shortcuts if App Host fails to install.
+    return;
+  }
+
   shortcut_info_ = ShortcutInfoForExtensionAndProfile(extension, profile_);
 
   std::vector<ImageLoadingTracker::ImageRepresentation> info_list;