Add metrics for when a cast is started or stopped from the system tray.

ash/system/cast/tray_cast.cc

 // Copyright 2015 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/system/cast/tray_cast.h"
 
 #include "ash/session/session_state_delegate.h"
 #include "ash/shelf/shelf_types.h"
 #include "ash/shell.h"
 #include "ash/system/chromeos/screen_security/screen_tray_item.h"
@@ skipping 208 matching lines @@
       Layout();
       break;
     }
   }
 }
 
 void CastCastView::ButtonPressed(views::Button* sender,
                                  const ui::Event& event) {
   DCHECK(sender == stop_button_);
   cast_config_delegate_->StopCasting();
+  Shell::GetInstance()->metrics()->RecordUserMetricsAction(
+      ash::UMA_STATUS_AREA_CAST_STOP_CAST);
 }
 
 // This view by itself does very little. It acts as a front-end for managing
 // which of the two child views (|CastSelectDefaultView| and |CastCastView|)
 // is active.
 class CastDuplexView : public views::View {
  public:
   CastDuplexView(SystemTrayItem* owner,
                  CastConfigDelegate* config_delegate,
                  bool show_more);
@@ skipping 252 matching lines @@
 void CastDetailedView::OnViewClicked(views::View* sender) {
   if (sender == footer()->content()) {
     TransitionToDefaultView();
   } else if (sender == options_) {
     cast_config_delegate_->LaunchCastOptions();
   } else {
     // Find the receiver we are going to cast to
     auto it = receiver_activity_map_.find(sender);
     if (it != receiver_activity_map_.end()) {
       cast_config_delegate_->CastToReceiver(it->second);
+      Shell::GetInstance()->metrics()->RecordUserMetricsAction(
+          ash::UMA_STATUS_AREA_DETAILED_CAST_VIEW_LAUNCH_CAST);
     }
   }
 }
 
 }  // namespace tray
 
 TrayCast::TrayCast(SystemTray* system_tray)
     : SystemTrayItem(system_tray),
       cast_config_delegate_(ash::Shell::GetInstance()
                                 ->system_tray_delegate()
@@ skipping 79 matching lines @@
   is_casting_ = started;
   UpdatePrimaryView();
 }
 
 void TrayCast::UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) {
   if (tray_)
     tray_->UpdateAlignment(alignment);
 }
 
 }  // namespace ash