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

chrome/browser/ui/ash/launcher/launcher_context_menu.cc

Index: chrome/browser/ui/ash/launcher/launcher_context_menu.cc
diff --git a/chrome/browser/ui/ash/launcher/launcher_context_menu.cc b/chrome/browser/ui/ash/launcher/launcher_context_menu.cc
index 82b7fdff32077629009f60e00f4a81da7367737a..8df12d96064afbefe2922931f41a9d370cb331b5 100644
--- a/chrome/browser/ui/ash/launcher/launcher_context_menu.cc
+++ b/chrome/browser/ui/ash/launcher/launcher_context_menu.cc
@@ -13,6 +13,7 @@
 #include "ash/shell_port.h"
 #include "ash/strings/grit/ash_strings.h"
 #include "ash/wallpaper/wallpaper_delegate.h"
+#include "ash/wm/maximize_mode/maximize_mode_controller.h"
 #include "build/build_config.h"
 #include "chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager.h"
 #include "chrome/browser/fullscreen.h"
@@ -126,6 +127,12 @@ void LauncherContextMenu::ExecuteCommand(int command_id, int event_flags) {
       }
       ash::ShellPort::Get()->RecordUserMetricsAction(
           ash::UMA_CLOSE_THROUGH_CONTEXT_MENU);
+      if (ash::Shell::Get()
+              ->maximize_mode_controller()
+              ->IsMaximizeModeWindowManagerEnabled()) {
+        ash::ShellPort::Get()->RecordUserMetricsAction(
+            ash::UMA_TABLET_WINDOW_CLOSE_THROUGH_CONTXT_MENU);
+      }
       break;
     case MENU_PIN:
       if (controller_->IsAppPinned(item_.id.app_id))