Record time between switching the active window from Ash overview mode

ash/metrics/task_switch_metrics_recorder_unittest.cc

Index: ash/metrics/task_switch_metrics_recorder_unittest.cc
diff --git a/ash/metrics/task_switch_metrics_recorder_unittest.cc b/ash/metrics/task_switch_metrics_recorder_unittest.cc
index 4851482bca4a20f2bad0bab44bf3e67ed5b2646b..45d47876e6a2ed7ad4fa37ceea6db203cc0130c8 100644
--- a/ash/metrics/task_switch_metrics_recorder_unittest.cc
+++ b/ash/metrics/task_switch_metrics_recorder_unittest.cc
@@ -107,4 +107,19 @@ TEST_F(TaskSwitchMetricsRecorderTest,
   histogram_tester_->ExpectTotalCount(kHistogramName, 2);
 }
 
+// Verifies that the TaskSwitchMetricsRecorder::kOverviewMode source adds data
+// to the Ash.WindowSelector.TimeBetweenActiveWindowChanges histogram.
+TEST_F(TaskSwitchMetricsRecorderTest,
+       VerifyTaskSwitchesFromOverviewModeAreRecorded) {
+  const std::string kHistogramName =
+      "Ash.WindowSelector.TimeBetweenActiveWindowChanges";
+
+  OnTaskSwitch(TaskSwitchMetricsRecorder::kOverviewMode);
+  OnTaskSwitch(TaskSwitchMetricsRecorder::kOverviewMode);
+  histogram_tester_->ExpectTotalCount(kHistogramName, 1);
+
+  OnTaskSwitch(TaskSwitchMetricsRecorder::kOverviewMode);
+  histogram_tester_->ExpectTotalCount(kHistogramName, 2);
+}
+
 }  // namespace ash