Fix policy invalidator lifecycle bugs for Android.

chrome/browser/policy/cloud/cloud_policy_core.h

Index: chrome/browser/policy/cloud/cloud_policy_core.h
diff --git a/chrome/browser/policy/cloud/cloud_policy_core.h b/chrome/browser/policy/cloud/cloud_policy_core.h
index 96135dc23036a7299680895e9a99466862b5733d..199f36b017b750b5829a09c3bd1d243fe7f3a7c3 100644
--- a/chrome/browser/policy/cloud/cloud_policy_core.h
+++ b/chrome/browser/policy/cloud/cloud_policy_core.h
@@ -9,6 +9,7 @@
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/observer_list.h"
 #include "base/prefs/pref_member.h"
 #include "chrome/browser/policy/cloud/cloud_policy_constants.h"
 
@@ -29,6 +30,21 @@ class CloudPolicyStore;
 // CloudPolicyRefreshScheduler which triggers periodic refreshes.
 class CloudPolicyCore {
  public:
+  // Callbacks for policy core events.
+  class Observer {
+   public:
+    virtual ~Observer();
+
+    // Called after the core is connected.
+    virtual void OnCoreConnected(CloudPolicyCore* core) = 0;
+
+    // Called after the refresh scheduler is started.
+    virtual void OnRefreshSchedulerStarted(CloudPolicyCore* core) = 0;
+
+    // Called before the core is disconnected.
+    virtual void OnCoreDisconnected(CloudPolicyCore* core) = 0;
+  };
+
   CloudPolicyCore(const PolicyNamespaceKey& policy_ns_key,
                   CloudPolicyStore* store);
   ~CloudPolicyCore();
@@ -67,6 +83,12 @@ class CloudPolicyCore {
   void TrackRefreshDelayPref(PrefService* pref_service,
                              const std::string& refresh_pref_name);
 
+  // Registers an observer to be notified of policy core events.
+  void AddObserver(Observer* observer);
+
+  // Removes the specified observer.
+  void RemoveObserver(Observer* observer);
+
  private:
   // Updates the refresh scheduler on refresh delay changes.
   void UpdateRefreshDelayFromPref();
@@ -77,6 +99,7 @@ class CloudPolicyCore {
   scoped_ptr<CloudPolicyService> service_;
   scoped_ptr<CloudPolicyRefreshScheduler> refresh_scheduler_;
   scoped_ptr<IntegerPrefMember> refresh_delay_;
+  ObserverList<Observer, true> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(CloudPolicyCore);
 };