Added UMA statistics for changing the active window via click or touch events.

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/session/session_state_delegate.h"
 #include "ash/shelf/shelf_delegate.h"
 #include "ash/shelf/shelf_item_types.h"
 #include "ash/shelf/shelf_layout_manager.h"
@@ skipping 276 matching lines @@
       base::RecordAction(base::UserMetricsAction("Mouse_Down"));
       break;
     case ash::UMA_PANEL_MINIMIZE_CAPTION_CLICK:
       base::RecordAction(
          base::UserMetricsAction("Panel_Minimize_Caption_Click"));
       break;
     case ash::UMA_PANEL_MINIMIZE_CAPTION_GESTURE:
       base::RecordAction(
           base::UserMetricsAction("Panel_Minimize_Caption_Gesture"));
       break;
+    case ash::UMA_SCREEN_EVENT_SWITCH_TASK:
+      base::RecordAction(base::UserMetricsAction("ScreenEvent_SwitchTask"));

[tdanderson, 2015/05/26 21:13:52]

don't forget to update actions.xml

[bruthig, 2015/06/03 21:59:31]

Done.

+      task_switch_metrics_recorder_.OnTaskSwitch(
+          TaskSwitchMetricsRecorder::kScreen);
+      break;
     case ash::UMA_SHELF_ALIGNMENT_SET_BOTTOM:
       base::RecordAction(
           base::UserMetricsAction("Shelf_AlignmentSetBottom"));
       break;
     case ash::UMA_SHELF_ALIGNMENT_SET_LEFT:
       base::RecordAction(
           base::UserMetricsAction("Shelf_AlignmentSetLeft"));
       break;
     case ash::UMA_SHELF_ALIGNMENT_SET_RIGHT:
       base::RecordAction(
@@ skipping 326 matching lines @@
   return IsUserActive() && !IsKioskModeActive();
 }
 
 void UserMetricsRecorder::StartTimer() {
   timer_.Start(FROM_HERE,
                base::TimeDelta::FromSeconds(kAshPeriodicMetricsTimeInSeconds),
                this, &UserMetricsRecorder::RecordPeriodicMetrics);
 }
 
 }  // namespace ash