Add UMA histograms for time between policy fetches

components/policy/core/common/cloud/cloud_policy_client.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 COMPONENTS_POLICY_CORE_COMMON_CLOUD_CLOUD_POLICY_CLIENT_H_
 #define COMPONENTS_POLICY_CORE_COMMON_CLOUD_CLOUD_POLICY_CLIENT_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 203 matching lines @@
   // Removes the specified observer.
   void RemoveObserver(Observer* observer);
 
   const std::string& machine_id() const { return machine_id_; }
   const std::string& machine_model() const { return machine_model_; }
 
   void set_last_policy_timestamp(const base::Time& timestamp) {
     last_policy_timestamp_ = timestamp;
   }
 
+  const base::Time& last_policy_timestamp() { return last_policy_timestamp_; }
+
   void set_public_key_version(int public_key_version) {
     public_key_version_ = public_key_version;
     public_key_version_valid_ = true;
   }
 
   void clear_public_key_version() {
     public_key_version_valid_ = false;
   }
 
   // FetchPolicy() calls will request this policy type.
@@ skipping 202 matching lines @@
 
   // Used to create tasks which run delayed on the UI thread.
   base::WeakPtrFactory<CloudPolicyClient> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CloudPolicyClient);
 };
 
 }  // namespace policy
 
 #endif  // COMPONENTS_POLICY_CORE_COMMON_CLOUD_CLOUD_POLICY_CLIENT_H_