UMA stats for stylus usage

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/common/session/session_state_delegate.h"
 #include "ash/common/shelf/shelf_delegate.h"
 #include "ash/common/shelf/shelf_item_types.h"
 #include "ash/common/shelf/shelf_model.h"
 #include "ash/common/shelf/shelf_view.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/system/tray/system_tray_delegate.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "ash/metrics/desktop_task_switch_metric_recorder.h"
 #include "ash/shell.h"
 #include "ash/wm/window_state_aura.h"
+#include "base/memory/ptr_util.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/user_metrics.h"
 #include "ui/aura/window.h"
 
+#if defined(OS_CHROMEOS)
+#include "ash/common/metrics/pointer_metrics_recorder.h"
+#endif
+
 namespace ash {
 
 namespace {
 
 // Time in seconds between calls to "RecordPeriodicMetrics".
 const int kAshPeriodicMetricsTimeInSeconds = 30 * 60;
 
 enum ActiveWindowStateType {
   ACTIVE_WINDOW_STATE_TYPE_NO_ACTIVE_WINDOW,
   ACTIVE_WINDOW_STATE_TYPE_OTHER,
@@ skipping 553 matching lines @@
   }
 }
 
 void UserMetricsRecorder::OnShellInitialized() {
   // Lazy creation of the DesktopTaskSwitchMetricRecorder because it accesses
   // Shell::GetInstance() which is not available when |this| is instantiated.
   if (!desktop_task_switch_metric_recorder_) {
     desktop_task_switch_metric_recorder_.reset(
         new DesktopTaskSwitchMetricRecorder());
   }
+#if defined(OS_CHROMEOS)
+  pointer_metrics_recorder_ = base::MakeUnique<PointerMetricsRecorder>();
+#endif
 }
 
 void UserMetricsRecorder::OnShellShuttingDown() {
   desktop_task_switch_metric_recorder_.reset();
+
+#if defined(OS_CHROMEOS)
+  // To clean up pointer_metrics_recorder_ properly, a valid shell instance is
+  // required. So explicitly delete it before the shell instance becomes

[Daniel Erat, 2016/09/29 22:58:46]

total nit: change ". So" to ", so"

[xiaoyinh(OOO Sep 11-29), 2016/09/30 00:25:40]

Done.

+  // invalid.
+  pointer_metrics_recorder_.reset();
+#endif
 }
 
 void UserMetricsRecorder::RecordPeriodicMetrics() {
   WmShelf* shelf = WmShelf::ForWindow(WmShell::Get()->GetPrimaryRootWindow());
   // TODO(bruthig): Investigating whether the check for |manager| is necessary
   // and add tests if it is.
   if (shelf) {
     // TODO(bruthig): Consider tracking the time spent in each alignment.
     UMA_HISTOGRAM_ENUMERATION("Ash.ShelfAlignmentOverTime",
                               shelf->SelectValueForShelfAlignment(
@@ skipping 22 matching lines @@
   return IsUserActive() && !IsKioskModeActive();
 }
 
 void UserMetricsRecorder::StartTimer() {
   timer_.Start(FROM_HERE,
                base::TimeDelta::FromSeconds(kAshPeriodicMetricsTimeInSeconds),
                this, &UserMetricsRecorder::RecordPeriodicMetrics);
 }
 
 }  // namespace ash