UMA stats for stylus usage

chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl.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 "chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl.h"
 
 #include <stddef.h>
 
 #include <vector>
 
@@ skipping 82 matching lines @@
 #include "extensions/common/url_pattern.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/window_open_disposition.h"
 #include "ui/keyboard/keyboard_util.h"
 #include "ui/resources/grit/ui_resources.h"
 #include "ui/wm/core/window_animations.h"
 
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/ui/ash/metrics/stylus_metrics_recorder_chromeos.h"
+#endif
+
 using extensions::Extension;
 using extensions::UnloadedExtensionInfo;
 using extension_misc::kGmailAppId;
 using content::WebContents;
 
 namespace {
 
 int64_t GetDisplayIDForShelf(ash::WmShelf* shelf) {
   display::Display display =
       shelf->GetWindow()->GetRootWindow()->GetDisplayNearestWindow();
@@ skipping 757 matching lines @@
 
 void ChromeLauncherControllerImpl::OnShelfCreated(ash::WmShelf* shelf) {
   PrefService* prefs = profile_->GetPrefs();
   const int64_t display = GetDisplayIDForShelf(shelf);
 
   shelf->SetAutoHideBehavior(
       ash::launcher::GetShelfAutoHideBehaviorPref(prefs, display));
 
   if (ash::ShelfWidget::ShelfAlignmentAllowed())
     shelf->SetAlignment(ash::launcher::GetShelfAlignmentPref(prefs, display));
+#if defined(OS_CHROMEOS)
+  stylus_metrics_recorder_ =
+      base::MakeUnique<chromeos::StylusMetricsRecorder>();
+#endif
 }
 
-void ChromeLauncherControllerImpl::OnShelfDestroyed(ash::WmShelf* shelf) {}
+void ChromeLauncherControllerImpl::OnShelfDestroyed(ash::WmShelf* shelf) {
+#if defined(OS_CHROMEOS)
+  // To clean up stylus_metrics_recorder_ properly, a valid shell instance is
+  // required. So explicityly delete it before the shell instance becomes
+  // invalid.
+  stylus_metrics_recorder_.reset();
+#endif
+}
 
 void ChromeLauncherControllerImpl::OnShelfAlignmentChanged(
     ash::WmShelf* shelf) {
   ash::launcher::SetShelfAlignmentPref(
       profile_->GetPrefs(), GetDisplayIDForShelf(shelf), shelf->alignment());
 }
 
 void ChromeLauncherControllerImpl::OnShelfAutoHideBehaviorChanged(
     ash::WmShelf* shelf) {
   ash::launcher::SetShelfAutoHideBehaviorPref(profile_->GetPrefs(),
@@ skipping 818 matching lines @@
     if (index == -1)
       continue;
     ash::ShelfItem item = model_->items()[index];
     item.image = image;
     if (arc_deferred_launcher_)
       arc_deferred_launcher_->MaybeApplySpinningEffect(id, &item.image);
     model_->Set(index, item);
     // It's possible we're waiting on more than one item, so don't break.
   }
 }