Added UMA metrics for screen capture UI in the status area.

ash/common/system/chromeos/screen_security/screen_tray_item.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/common/system/chromeos/screen_security/screen_tray_item.h"
 
 #include "ash/common/shelf/wm_shelf_util.h"
 #include "ash/common/system/tray/fixed_sized_image_view.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ui/base/resource/resource_bundle.h"
@@ skipping 59 matching lines @@
     label_bounds.set_width(stop_button_->x() - kTrayPopupPaddingBetweenItems -
                            label_->x());
     label_->SetBoundsRect(label_bounds);
   }
 }
 
 void ScreenStatusView::ButtonPressed(views::Button* sender,
                                      const ui::Event& event) {
   DCHECK(sender == stop_button_);
   screen_tray_item_->Stop();
+  screen_tray_item_->RecordStoppedFromDefaultViewMetric();
 }
 
 void ScreenStatusView::CreateItems() {
   set_background(views::Background::CreateSolidBackground(kBackgroundColor));
   ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
   SetLayoutManager(new views::BoxLayout(views::BoxLayout::kHorizontal,
                                         kTrayPopupPaddingHorizontal, 0,
                                         kTrayPopupPaddingBetweenItems));
   icon_ = new FixedSizedImageView(0, kTrayPopupItemHeight);
   icon_->SetImage(bundle.GetImageNamed(icon_id_).ToImageSkia());
@@ skipping 16 matching lines @@
 
 ScreenNotificationDelegate::ScreenNotificationDelegate(
     ScreenTrayItem* screen_tray)
     : screen_tray_(screen_tray) {}
 
 ScreenNotificationDelegate::~ScreenNotificationDelegate() {}
 
 void ScreenNotificationDelegate::ButtonClick(int button_index) {
   DCHECK_EQ(0, button_index);
   screen_tray_->Stop();
+  screen_tray_->RecordStoppedFromNotificationViewMetric();
 }
 
 }  // namespace tray
 
 ScreenTrayItem::ScreenTrayItem(SystemTray* system_tray)
     : SystemTrayItem(system_tray),
       tray_view_(NULL),
       default_view_(NULL),
       is_started_(false),
       stop_callback_(base::Bind(&base::DoNothing)) {}
@@ skipping 34 matching lines @@
   Update();
 
   if (stop_callback_.is_null())
     return;
 
   base::Closure callback = stop_callback_;
   stop_callback_.Reset();
   callback.Run();
 }
 
+void ScreenTrayItem::RecordStoppedFromDefaultViewMetric() {}
+
+void ScreenTrayItem::RecordStoppedFromNotificationViewMetric() {}
+
 void ScreenTrayItem::DestroyTrayView() {
   tray_view_ = NULL;
 }
 
 void ScreenTrayItem::DestroyDefaultView() {
   default_view_ = NULL;
 }
 
 void ScreenTrayItem::UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) {
   if (!tray_view_)
     return;
 
   // Center the item dependent on the orientation of the shelf.
   views::BoxLayout::Orientation layout = IsHorizontalAlignment(alignment)
                                              ? views::BoxLayout::kHorizontal
                                              : views::BoxLayout::kVertical;
   tray_view_->SetLayoutManager(new views::BoxLayout(layout, 0, 0, 0));
   tray_view_->Layout();
 }
 
 }  // namespace ash