Added Launcher_SwitchTask UMA user action.

ash/metrics/user_metrics_recorder.cc

 // Copyright 2013 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 "ash/metrics/user_metrics_recorder.h"
 
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shelf/shelf_view.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
@@ skipping 185 matching lines @@
     case ash::UMA_LAUNCHER_CLICK_ON_APP:
       base::RecordAction(base::UserMetricsAction("Launcher_ClickOnApp"));
       break;
     case ash::UMA_LAUNCHER_CLICK_ON_APPLIST_BUTTON:
       base::RecordAction(
           base::UserMetricsAction("Launcher_ClickOnApplistButton"));
       break;
     case ash::UMA_LAUNCHER_LAUNCH_TASK:
       base::RecordAction(base::UserMetricsAction("Launcher_LaunchTask"));
       break;
+    case ash::UMA_LAUNCHER_SWITCH_TASK:
+      base::RecordAction(base::UserMetricsAction("Launcher_SwitchTask"));
+      break;
     case UMA_MAXIMIZE_MODE_DISABLED:
       base::RecordAction(base::UserMetricsAction("Touchview_Disabled"));
       break;
     case UMA_MAXIMIZE_MODE_ENABLED:
       base::RecordAction(base::UserMetricsAction("Touchview_Enabled"));
       break;
     case UMA_MAXIMIZE_MODE_INITIALLY_DISABLED:
       base::RecordAction(
           base::UserMetricsAction("Touchview_Initially_Disabled"));
       break;
@@ skipping 315 matching lines @@
 
   UMA_HISTOGRAM_COUNTS_100("Ash.NumberOfVisibleWindowsInPrimaryDisplay",
                            GetNumVisibleWindowsInPrimaryDisplay());
 
   UMA_HISTOGRAM_ENUMERATION("Ash.ActiveWindowShowTypeOverTime",
                             GetActiveWindowState(),
                             ACTIVE_WINDOW_STATE_TYPE_COUNT);
 }
 
 }  // namespace ash