Enable login screen apps.

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 46ddb77bd244b70ec9440edda53a4dffc945c18c..4a63663b31a855f6798271518ac608df11090bb4 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -105,6 +105,7 @@
 
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/extensions/install_limiter.h"
+#include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "storage/browser/fileapi/file_system_backend.h"
 #include "storage/browser/fileapi/file_system_context.h"
 #endif
@@ -441,7 +442,15 @@ void ExtensionService::Init() {
 
   // LoadAllExtensions() calls OnLoadedInstalledExtensions().
   component_loader_->LoadAll();
-  extensions::InstalledLoader(this).LoadAllExtensions();
+  bool load_saved_extensions = true;
+#if defined(OS_CHROMEOS)
+  if (chromeos::ProfileHelper::IsSigninProfile(profile_))
+    load_saved_extensions = false;
+#endif
+  if (load_saved_extensions)
+    extensions::InstalledLoader(this).LoadAllExtensions();
+  else
+    OnLoadedInstalledExtensions();  // Callback from LoadAllExtensions.

[Devlin, 2017/03/22 22:57:39]

nit: elaborate a bit on this comment. Also, this flow is somewhat silly
(unrelated to this CL) - mind adding a TODO(me) to clean it up?

if (load_saved_extensions) {
  extensions::InstalledLoader(this).LoadAllExtensions();
} else {
  // InstalledLoader::LoadAllExtensions normally calls
OnLoadedInstalledExtensions
  // itself, but here we circumvent that path. Call OnLoadedInstalledExtensions
  // directly.
  // TODO(devlin): LoadInstalledExtensions() is synchronous - we can simplify
  // this.
  OnLoadedInstalledExtensions();
}

[achuithb, 2017/03/23 00:26:26]

Done.

I thought about refactoring this, but I think a follow-up CL would be better.

   LoadExtensionsFromCommandLineFlag(switches::kDisableExtensionsExcept);
   if (extensions_enabled_)
     LoadExtensionsFromCommandLineFlag(switches::kLoadExtension);