add device type as an argument in OnDevicesChanged.

base/system_monitor/system_monitor_unittest.cc

 // 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.
 
 #include "base/system_monitor/system_monitor.h"
 
 #include "base/file_path.h"
 #include "base/message_loop.h"
 #include "base/test/mock_devices_changed_observer.h"
 #include "base/utf_string_conversions.h"
@@ skipping 100 matching lines @@
   const int kObservers = 5;
   const string16 kDeviceName = ASCIIToUTF16("media device");
   const std::string kDeviceId1 = "1";
   const std::string kDeviceId2 = "2";
 
   testing::Sequence mock_sequencer[kObservers];
   MockDevicesChangedObserver observers[kObservers];
   for (int index = 0; index < kObservers; ++index) {
     system_monitor_->AddDevicesChangedObserver(&observers[index]);
 
-    EXPECT_CALL(observers[index], OnDevicesChanged())
+    EXPECT_CALL(observers[index],
+                OnDevicesChanged(base::SystemMonitor::DEVTYPE_UNKNOWN))
         .Times(3)
         .InSequence(mock_sequencer[index]);
     EXPECT_CALL(observers[index],
                 OnMediaDeviceAttached(kDeviceId1,
                                       kDeviceName,
                                       base::SystemMonitor::TYPE_PATH,
                                       testing::_))
         .InSequence(mock_sequencer[index]);
     EXPECT_CALL(observers[index], OnMediaDeviceDetached(kDeviceId1))
         .InSequence(mock_sequencer[index]);
     EXPECT_CALL(observers[index], OnMediaDeviceDetached(kDeviceId2))
         .InSequence(mock_sequencer[index]);
   }
 
-  system_monitor_->ProcessDevicesChanged();
+  system_monitor_->ProcessDevicesChanged(base::SystemMonitor::DEVTYPE_UNKNOWN);
   message_loop_.RunAllPending();
 
-  system_monitor_->ProcessDevicesChanged();
-  system_monitor_->ProcessDevicesChanged();
+  system_monitor_->ProcessDevicesChanged(base::SystemMonitor::DEVTYPE_UNKNOWN);
+  system_monitor_->ProcessDevicesChanged(base::SystemMonitor::DEVTYPE_UNKNOWN);
   message_loop_.RunAllPending();
 
   system_monitor_->ProcessMediaDeviceAttached(
       kDeviceId1,
       kDeviceName,
       base::SystemMonitor::TYPE_PATH,
       FILE_PATH_LITERAL("path"));
   message_loop_.RunAllPending();
 
   system_monitor_->ProcessMediaDeviceDetached(kDeviceId1);
@@ skipping 54 matching lines @@
 
   system_monitor_->ProcessMediaDeviceDetached(kDeviceId2);
   message_loop_.RunAllPending();
   devices = system_monitor_->GetAttachedMediaDevices();
   EXPECT_EQ(0U, devices.size());
 }
 
 }  // namespace
 
 }  // namespace base