Install and launch kiosk app from cached crx file at start up.

chrome/browser/extensions/external_provider_impl.cc

Index: chrome/browser/extensions/external_provider_impl.cc
diff --git a/chrome/browser/extensions/external_provider_impl.cc b/chrome/browser/extensions/external_provider_impl.cc
index ed1a417b4a6e72ae87f6782412eb48f0fd3d3156..a4a5e5d426f961bae55b606343abe9e3d8996715 100644
--- a/chrome/browser/extensions/external_provider_impl.cc
+++ b/chrome/browser/extensions/external_provider_impl.cc
@@ -34,6 +34,7 @@
 #include "ui/base/l10n/l10n_util.h"
 
 #if defined(OS_CHROMEOS)
+#include "chrome/browser/chromeos/app_mode/kiosk_app_manager.h"
 #include "chrome/browser/chromeos/customization_document.h"
 #include "chrome/browser/chromeos/extensions/device_local_account_external_policy_loader.h"
 #include "chrome/browser/chromeos/login/users/user.h"
@@ -398,16 +399,31 @@ void ExternalProviderImpl::CreateExternalProviders(
                 Extension::NO_FLAGS)));
   }
 
+  // Load the KioskAppExternalProvider when running in kiosk mode.
+  if (chrome::IsRunningInForcedAppMode()) {
+#if defined(OS_CHROMEOS)
+    chromeos::KioskAppManager* kiosk_app_manager =
+        chromeos::KioskAppManager::Get();
+    DCHECK(kiosk_app_manager);
+    if (kiosk_app_manager && !kiosk_app_manager->external_loader_created()) {
+      provider_list->push_back(linked_ptr<ExternalProviderInterface>(
+          new ExternalProviderImpl(service,
+                                   kiosk_app_manager->CreateExternalLoader(),
+                                   profile,
+                                   Manifest::EXTERNAL_PREF,
+                                   Manifest::INVALID_LOCATION,
+                                   Extension::NO_FLAGS)));
+    }
+#endif
+    return;
+  }
+
   // In tests don't install extensions from default external sources.
   // It would only slowdown tests and make them flaky.
   if (CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kDisableDefaultApps))
     return;
 
-  // No external app install in app mode.
-  if (chrome::IsRunningInForcedAppMode())
-    return;
-
   // On Mac OS, items in /Library/... should be written by the superuser.
   // Check that all components of the path are writable by root only.
   ExternalPrefLoader::Options check_admin_permissions_on_mac;