Add policy domain for signin screen apps

components/policy/core/common/schema_registry.h

Index: components/policy/core/common/schema_registry.h
diff --git a/components/policy/core/common/schema_registry.h b/components/policy/core/common/schema_registry.h
index 82e16f8a958c2b1d8e054f7a6f9c0bf1d0c97661..729b99a1b93738fb2173a06d19fbc479a564609a 100644
--- a/components/policy/core/common/schema_registry.h
+++ b/components/policy/core/common/schema_registry.h
@@ -75,6 +75,11 @@ class POLICY_EXPORT SchemaRegistry : public base::NonThreadSafe {
   // registered. It must be invoked at least once for each policy domain;
   // subsequent calls for the same domain are ignored.
   void SetReady(PolicyDomain domain);
+  // This is equivalent to calling |SetReady| with each of the policy domains.
+  void SetAllDomainsReady();
+  // This is equivalent to calling |SetReady| with each of the domains that
+  // correspond to policy for extensions.
+  void SetExtensionsDomainsReady();
 
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);