Implement cloud policy invalidations using the invalidation service framework.

chrome/browser/policy/cloud/user_cloud_policy_invalidator.h

+// Copyright (c) 2013 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_CLOUD_USER_CLOUD_POLICY_INVALIDATOR_H_
+#define CHROME_BROWSER_POLICY_CLOUD_USER_CLOUD_POLICY_INVALIDATOR_H_
+
+#include "chrome/browser/policy/cloud/cloud_policy_invalidator.h"
+#include "components/browser_context_keyed_service/browser_context_keyed_service.h"
+
+namespace invalidation {
+class InvalidationService;
+}
+
+namespace policy {
+
+class CloudPolicyManager;
+
+// Provides invalidations to user policy. Implemented as a
+// BrowserContextKeyedService to allow profile-based lifetime management.
+class UserCloudPolicyInvalidator : public CloudPolicyInvalidator,

[rlarocque, 2013/07/25 19:23:40]

I'm curious: Why does this class exist?  Why not make the CloudPolicyInvalidator
inherit from BrowserContextKeyedService?

[Steve Condie, 2013/07/26 01:39:25]

The reason is that there are other types of cloud policy that aren't tied to a
user profile (for example, device-level policy, public account policy,
kiosk-mode policy). The intent is for CloudPolicyInvalidator to be generic
enough to handle all types of policy (even though for now it is only used for
user policy). So the user-policy-specific functionality of managing the object
lifetime around the user profile I think is better off going in a subclass.

+                                   public BrowserContextKeyedService {
+ public:
+  // |invalidation_service| is the invalidation service which generates the
+  // invalidations and must remain valid until Shutdown is called.
+  // |policy_manager| is the policy manager for the user policy and must remain
+  // valid until Shutdown is called.
+  UserCloudPolicyInvalidator(
+      invalidation::InvalidationService* invalidation_service,
+      CloudPolicyManager* policy_manager);
+
+  // BrowserContextKeyedService:
+  virtual void Shutdown() OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(UserCloudPolicyInvalidator);
+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_POLICY_CLOUD_USER_CLOUD_POLICY_INVALIDATOR_H_