Tether: Break helper TimerFactory out of BleConnectionManager and HostScanCache.

chromeos/components/tether/host_scan_cache.h

 // Copyright 2017 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 CHROMEOS_COMPONENTS_TETHER_HOST_SCAN_CACHE_H_
 #define CHROMEOS_COMPONENTS_TETHER_HOST_SCAN_CACHE_H_
 
 #include <memory>
 #include <unordered_map>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/timer/timer.h"
 #include "chromeos/components/tether/tether_host_response_recorder.h"
 
 namespace chromeos {
 
 class NetworkStateHandler;
 
 namespace tether {
 
 class ActiveHost;
 class DeviceIdTetherNetworkGuidMap;
 class TetherHostResponseRecorder;
+class TimerFactory;
 
 // Caches scan results and inserts them into the network stack.
 class HostScanCache : public TetherHostResponseRecorder::Observer {
  public:
   // The number of minutes that a cache entry is considered to be valid before
   // it becomes stale. Once a cache entry is inserted, it will be automatically
   // removed after this amount of time passes unless it corresponds to the
   // active host. This value was chosen for two reasons:
   //     (1) Tether properties such as battery percentage and signal strength
   //         are ephemeral in nature, so keeping these values cached for more
@@ skipping 34 matching lines @@
   virtual bool RemoveHostScanResult(const std::string& tether_network_guid);
 
   // Removes all scan results from the cache unless they correspond to the
   // active host; the active host must always remain in the cache while
   // connecting/connected to ensure the UI is up to date.
   virtual void ClearCacheExceptForActiveHost();
 
   // TetherHostResponseRecorder::Observer:
   void OnPreviouslyConnectedHostIdsChanged() override;
 
-  class TimerFactory {
-   public:
-    virtual std::unique_ptr<base::Timer> CreateOneShotTimer() = 0;
-  };
-
  private:
   friend class HostScanCacheTest;
 
   void SetTimerFactoryForTest(
       std::unique_ptr<TimerFactory> timer_factory_for_test);
 
   bool HasConnectedToHost(const std::string& tether_network_guid);
   void StartTimer(const std::string& tether_network_guid);
   void OnTimerFired(const std::string& tether_network_guid);
 
@@ skipping 12 matching lines @@
   base::WeakPtrFactory<HostScanCache> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HostScanCache);
 };
 
 }  // namespace tether
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_COMPONENTS_TETHER_HOST_SCAN_CACHE_H_