Implement fetching, caching and retrieval of external policy data

chrome/browser/policy/cloud/cloud_policy_store.cc

Index: chrome/browser/policy/cloud/cloud_policy_store.cc
diff --git a/chrome/browser/policy/cloud/cloud_policy_store.cc b/chrome/browser/policy/cloud/cloud_policy_store.cc
index 472c97d6ebb02508c0c4a7c5ce2ceebbd554b7dc..50085c00383442dae6acf8d8a4e9f4d477a8cf0b 100644
--- a/chrome/browser/policy/cloud/cloud_policy_store.cc
+++ b/chrome/browser/policy/cloud/cloud_policy_store.cc
@@ -5,6 +5,8 @@
 #include "chrome/browser/policy/cloud/cloud_policy_store.h"
 
 #include "base/hash.h"
+#include "base/logging.h"
+#include "chrome/browser/policy/cloud/cloud_external_data_manager.h"
 
 namespace policy {
 
@@ -45,6 +47,12 @@ void CloudPolicyStore::NotifyStoreLoaded() {
   hash_value_ = new_hash_value;
 
   is_initialized_ = true;
+  // The |external_data_manager_| must be notified first so that when other
+  // observers are informed about the changed policies and try to fetch external
+  // data referenced by these, the |external_data_manager_| has the required
+  // metadata already.
+  if (external_data_manager_)
+    external_data_manager_->OnPolicyStoreLoaded();
   FOR_EACH_OBSERVER(Observer, observers_, OnStoreLoaded(this));
 }
 
@@ -53,4 +61,12 @@ void CloudPolicyStore::NotifyStoreError() {
   FOR_EACH_OBSERVER(Observer, observers_, OnStoreError(this));
 }
 
+void CloudPolicyStore::SetExternalDataManager(
+    base::WeakPtr<CloudExternalDataManager> external_data_manager) {
+  DCHECK(!external_data_manager_);
+  external_data_manager_ = external_data_manager;
+  if (is_initialized_)
+    external_data_manager_->OnPolicyStoreLoaded();
+}
+
 }  // namespace policy