Enable login screen apps.

extensions/browser/process_manager_delegate.h

Index: extensions/browser/process_manager_delegate.h
diff --git a/extensions/browser/process_manager_delegate.h b/extensions/browser/process_manager_delegate.h
index 7cc48c0af74ee81ab9db0e1eddc88bcbe1580e10..2e5838c31f343d189a57e662af0fd24e086c80d0 100644
--- a/extensions/browser/process_manager_delegate.h
+++ b/extensions/browser/process_manager_delegate.h
@@ -11,6 +11,8 @@ class BrowserContext;
 
 namespace extensions {
 
+class Extension;
+
 // Customization of ProcessManager for the extension system embedder.
 class ProcessManagerDelegate {
  public:
@@ -18,9 +20,15 @@ class ProcessManagerDelegate {
 
   // Returns true if the embedder allows background pages for the given
   // |context|.
-  virtual bool IsBackgroundPageAllowed(
+  virtual bool AreBackgroundPagesAllowedForContext(
       content::BrowserContext* context) const = 0;
 
+  // Returns true if the embedder allows background pages for the given
+  // |context|, and a given |extension|.
+  virtual bool IsExtensionBackgroundPageAllowed(
+      content::BrowserContext* context,
+      const Extension* extension) const = 0;

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

|extension| can no longer be null, right?  Can be we make it a const& to reflect
that?

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

Done.

+
   // Returns true if the embedder wishes to defer starting up the renderers for
   // extension background pages. If the embedder returns true it must call
   // ProcessManager::MaybeCreateStartupBackgroundHosts() when it is ready. See