Files.app: Add UMA for HardUnplugged events.

chrome/browser/chromeos/extensions/file_manager/device_event_router.h

 // Copyright 2014 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 CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_DEVICE_EVENT_ROUTER_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_DEVICE_EVENT_ROUTER_H_
 
 #include <map>
 #include <string>
 
@@ skipping 80 matching lines @@
 
   // Whether the system is resuming or not.
   bool is_resuming_;
 
   // Map of device path and device state.
   std::map<std::string, DeviceState> device_states_;
 
   // Thread checker.
   base::ThreadChecker thread_checker_;
 
+  // Last event time for UMA.
+  // TODO(hirono): Remove the temporarily UMA.  crbug.com/433734
+  base::Time last_hard_unplugged_;
+  base::Time last_suspend_done_;
+
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate the weak pointers before any other members are destroyed.
   base::WeakPtrFactory<DeviceEventRouter> weak_factory_;
   DISALLOW_COPY_AND_ASSIGN(DeviceEventRouter);
 };
 }  // namespace file_manager
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_DEVICE_EVENT_ROUTER_H_