add UMA metrics for voice interaction entries.

ash/shelf/app_list_button.cc

 // Copyright 2014 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/shelf/app_list_button.h"
 
 #include <memory>
 #include <utility>
 
 #include "ash/public/cpp/shelf_types.h"
 #include "ash/shelf/ink_drop_button_listener.h"
 #include "ash/shelf/shelf_constants.h"
 #include "ash/shelf/shelf_view.h"
 #include "ash/shelf/wm_shelf.h"
 #include "ash/shell.h"
 #include "ash/strings/grit/ash_strings.h"
 #include "ash/system/tray/tray_popup_utils.h"
 #include "base/command_line.h"
 #include "base/memory/ptr_util.h"
+#include "base/metrics/user_metrics.h"
+#include "base/metrics/user_metrics_action.h"
 #include "chromeos/chromeos_switches.h"
 #include "ui/accessibility/ax_node_data.h"
 #include "ui/app_list/presenter/app_list.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/scoped_canvas.h"
 #include "ui/views/animation/flood_fill_ink_drop_ripple.h"
 #include "ui/views/animation/ink_drop_impl.h"
 #include "ui/views/animation/ink_drop_mask.h"
 #include "ui/views/painter.h"
@@ skipping 58 matching lines @@
       shelf_view_->PointerReleasedOnButton(this, ShelfView::TOUCH, false);
       event->SetHandled();
       return;
     case ui::ET_GESTURE_TAP_DOWN:
       if (!Shell::Get()->IsAppListVisible())
         AnimateInkDrop(views::InkDropState::ACTION_PENDING, event);
       ImageButton::OnGestureEvent(event);
       break;
     case ui::ET_GESTURE_LONG_PRESS:
       if (chromeos::switches::IsVoiceInteractionEnabled()) {
+        base::RecordAction(base::UserMetricsAction(
+            "VoiceInteraction.Started.AppListButtonLongPress"));
         Shell::Get()->app_list()->StartVoiceInteractionSession();
         event->SetHandled();
       } else {
         ImageButton::OnGestureEvent(event);
       }
       break;
     case ui::ET_GESTURE_LONG_TAP:
       if (chromeos::switches::IsVoiceInteractionEnabled()) {
         // Also consume the long tap event. This happens after the user long
         // presses and lifts the finger. We already handled the long press
@@ skipping 126 matching lines @@
     return gfx::Point(x_mid, x_mid);
   } else if (alignment == SHELF_ALIGNMENT_RIGHT) {
     return gfx::Point(y_mid, y_mid);
   } else {
     DCHECK_EQ(alignment, SHELF_ALIGNMENT_LEFT);
     return gfx::Point(width() - y_mid, y_mid);
   }
 }
 
 }  // namespace ash