Implement cloud policy invalidations using the invalidation service framework.

chrome/browser/policy/cloud/cloud_policy_store.cc

 // 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.
 
 #include "chrome/browser/policy/cloud/cloud_policy_store.h"
 
+#include "base/hash.h"
+
 namespace policy {
 
 CloudPolicyStore::Observer::~Observer() {}
 
 CloudPolicyStore::CloudPolicyStore()
     : status_(STATUS_OK),
       validation_status_(CloudPolicyValidatorBase::VALIDATION_OK),
-      is_initialized_(false) {}
+      invalidation_version_(0),
+      is_initialized_(false),
+      policy_changed_(false),
+      hash_value_(0) {}
 
 CloudPolicyStore::~CloudPolicyStore() {}
 
+void CloudPolicyStore::Store(
+    const enterprise_management::PolicyFetchResponse& policy,
+    int64 invalidation_version) {
+  invalidation_version_ = invalidation_version;
+  Store(policy);
+}
+
 void CloudPolicyStore::AddObserver(CloudPolicyStore::Observer* observer) {
   observers_.AddObserver(observer);
 }
 
 void CloudPolicyStore::RemoveObserver(CloudPolicyStore::Observer* observer) {
   observers_.RemoveObserver(observer);
 }
 
 void CloudPolicyStore::NotifyStoreLoaded() {
+  // Determine if the policy changed by comparing the new policy's hash value
+  // to the previous.
+  uint32 new_hash_value = 0;
+  if (policy_.get() && policy_->has_policy_value())

[Joao da Silva, 2013/07/24 15:34:07]

.get() is not needed to test the policy_ scoped_ptr

[Steve Condie, 2013/07/25 01:18:08]

Done.

+    new_hash_value = base::Hash(policy_->policy_value());

[Joao da Silva, 2013/07/24 15:34:07]

Note that base::Hash does a single pass over the string, so it's rather fast :-)
it's not a problem to do this on UI

+  policy_changed_ = new_hash_value != hash_value_;
+  hash_value_ = new_hash_value;
+
   is_initialized_ = true;
   FOR_EACH_OBSERVER(Observer, observers_, OnStoreLoaded(this));
 }
 
 void CloudPolicyStore::NotifyStoreError() {
   is_initialized_ = true;
   FOR_EACH_OBSERVER(Observer, observers_, OnStoreError(this));
 }
 
-}  // namespace
+}  // namespace policy