Implement kiosk multiple apps feature.

chrome/browser/extensions/extension_service.cc

Index: chrome/browser/extensions/extension_service.cc
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index 96e5fbff576f359e088cb9e4f2ed6823668c5b42..d8834d0fb11e70fbce8454809bc618354a46c14c 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -202,7 +202,9 @@ bool ExtensionService::OnExternalExtensionUpdateUrlFound(
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   CHECK(crx_file::id_util::IdIsValid(id));
 
-  if (Manifest::IsExternalLocation(location)) {
+  // Don't cache kiosk apps in external cache.
+  if (Manifest::IsExternalLocation(location) &&
+      !extensions::ExtensionsBrowserClient::Get()->IsRunningInForcedAppMode()) {

[not at google - send to devlin, 2015/08/26 17:53:58]

Can you write this comment in such a way that doesn't only draw attention to the
kiosk app? Something like "External extensions can be cached because they're the
same across users, but it's necessary to exclude kiosk apps because...?"

Nobody is really around that understands this code, so I need some help to
understand it.

[jennyz, 2015/08/28 18:24:08]

Done.

     // All extensions that are not user specific can be cached.
     extensions::ExtensionsBrowserClient::Get()->GetExtensionCache()
         ->AllowCaching(id);