Explicitly wait for user policy before completing login.

chrome/browser/policy/user_policy_cache.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_POLICY_USER_POLICY_CACHE_H_
 #define CHROME_BROWSER_POLICY_USER_POLICY_CACHE_H_
 #pragma once
 
 #include <string>
 
+#include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/values.h"
 #include "chrome/browser/policy/cloud_policy_cache_base.h"
 #include "chrome/browser/policy/user_policy_disk_cache.h"
 
 class FilePath;
 
 namespace enterprise_management {
 
 class CachedCloudPolicyResponse;
 // <Old-style policy support> (see comment below)
 class GenericValue;
 // </Old-style policy support>
 
 }  // namespace enterprise_management
 
 namespace policy {
 
 class PolicyMap;
 
 // CloudPolicyCacheBase implementation that persists policy information
 // into the file specified by the c'tor parameter |backing_file_path|.
 class UserPolicyCache : public CloudPolicyCacheBase,
                         public UserPolicyDiskCache::Delegate {
  public:
   // |backing_file_path| is the path to the cache file.
   // |wait_for_policy_fetch| is true if the cache should be ready only after
   // an attempt was made to fetch user policy.
+  // If |callback| is not null, it will be invoked once the cache is ready.
   UserPolicyCache(const FilePath& backing_file_path,
-                  bool wait_for_policy_fetch);
+                  bool wait_for_policy_fetch,
+                  const base::Closure& callback);
   virtual ~UserPolicyCache();
 
   // CloudPolicyCacheBase implementation:
   virtual void Load() OVERRIDE;
   virtual void SetPolicy(
       const enterprise_management::PolicyFetchResponse& policy) OVERRIDE;
   virtual void SetUnmanaged() OVERRIDE;
   virtual void SetFetchingDone() OVERRIDE;
 
  private:
@@ skipping 35 matching lines @@
   // Used for constructing the weak ptr passed to |disk_cache_|.
   base::WeakPtrFactory<UserPolicyDiskCache::Delegate> weak_ptr_factory_;
 
   // True if the disk cache has been loaded.
   bool disk_cache_ready_;
 
   // True if at least one attempt was made to refresh the cache with a freshly
   // fetched policy, or if there is no need to wait for that.
   bool fetch_ready_;
 
+  // Callback to invoke when the cache becomes ready.
+  base::Closure ready_callback_;
+
   DISALLOW_COPY_AND_ASSIGN(UserPolicyCache);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_USER_POLICY_CACHE_H_