Cros Tablet: Add UMA stats for the user close actions in tablet mode.

ash/frame/caption_buttons/frame_caption_button_container_view.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/frame/caption_buttons/frame_caption_button_container_view.h"
 
 #include <cmath>
 #include <map>
 
 #include "ash/frame/caption_buttons/frame_caption_button.h"
@@ skipping 320 matching lines @@
     } else {
       frame_->Maximize();
       action = UMA_WINDOW_MAXIMIZE_BUTTON_CLICK_MAXIMIZE;
     }
 
     if (event.IsGestureEvent())
       ShellPort::Get()->RecordGestureAction(GESTURE_FRAMEMAXIMIZE_TAP);
   } else if (sender == close_button_) {
     frame_->Close();
     action = UMA_WINDOW_CLOSE_BUTTON_CLICK;
+    if (ash::Shell::Get()
+            ->maximize_mode_controller()
+            ->IsMaximizeModeWindowManagerEnabled()) {
+      action = UMA_TABLET_WINDOW_CLOSE_THROUGH_CAPTION_BUTTON;
+    }
   } else {
     return;
   }
   ShellPort::Get()->RecordUserMetricsAction(action);
 }
 
 bool FrameCaptionButtonContainerView::IsMinimizeButtonVisible() const {
   return minimize_button_->visible();
 }
 
@@ skipping 53 matching lines @@
     views::Button::ButtonState new_state = views::Button::STATE_NORMAL;
     if (button == to_hover)
       new_state = views::Button::STATE_HOVERED;
     else if (button == to_press)
       new_state = views::Button::STATE_PRESSED;
     button->SetState(new_state);
   }
 }
 
 }  // namespace ash