Added RefreshPolicies to PolicyService.

chrome/browser/policy/policy_service_impl.h

Index: chrome/browser/policy/policy_service_impl.h
diff --git a/chrome/browser/policy/policy_service_impl.h b/chrome/browser/policy/policy_service_impl.h
index be6697551fd9f6cd007f0e871d745a60600809f6..18ee6d7feeec8e54db4815aa6a72d67208376169 100644
--- a/chrome/browser/policy/policy_service_impl.h
+++ b/chrome/browser/policy/policy_service_impl.h
@@ -41,6 +41,7 @@ class PolicyServiceImpl : public PolicyService,
       PolicyDomain domain,
       const std::string& component_id) const OVERRIDE;
   virtual bool IsInitializationComplete() const OVERRIDE;
+  virtual void RefreshPolicies(const base::Closure& callback) OVERRIDE;
 
  private:
   struct Entry;
@@ -63,7 +64,9 @@ class PolicyServiceImpl : public PolicyService,
 
   // Combines the policies from all the providers, and notifies the observers
   // of namespaces whose policies have been modified.
-  void MergeAndTriggerUpdates();
+  // |is_refresh| should be true if MergeAndTriggerUpdates() was invoked because
+  // a provider has just refreshed its policies.
+  void MergeAndTriggerUpdates(bool is_refresh);
 
   // Contains all the providers together with a cached copy of their policies
   // and their registrars.
@@ -75,6 +78,10 @@ class PolicyServiceImpl : public PolicyService,
   // True if all the providers are initialized.
   bool initialization_complete_;
 
+  // List of callbacks to invoke once all providers refresh after a
+  // RefreshPolicies() call.
+  std::vector<base::Closure> refresh_callbacks_;
+
   DISALLOW_COPY_AND_ASSIGN(PolicyServiceImpl);
 };