mash: Limit ShelfWindowWatcher to panels and dialogs.

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

 // Copyright 2016 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 "chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.h"
 
 #include <string>
 
 #include "ash/display/screen_orientation_controller_chromeos.h"
 #include "ash/public/cpp/shelf_model.h"
 #include "ash/public/cpp/window_properties.h"
@@ skipping 270 matching lines @@
   // the layout switch information.
   if (!observing_shell_) {
     observing_shell_ = true;
     ash::Shell::Get()->AddShellObserver(this);
   }
 
   // Check if we have controller for this task.
   if (GetAppWindowForTask(task_id))
     return;
 
+  window->SetProperty<int>(ash::kShelfItemTypeKey, ash::TYPE_APP);
   window->SetProperty(aura::client::kAppType,
                       static_cast<int>(ash::AppType::ARC_APP));
 
   // Create controller if we have task info.
   AppWindowInfo* info = GetAppWindowInfoForTask(task_id);
   if (!info) {
     VLOG(1) << "Could not find AppWindowInfo for task:" << task_id;
     return;
   }
 
@@ skipping 350 matching lines @@
   const std::string* arc_app_id = exo::ShellSurface::GetApplicationId(window);
   if (!arc_app_id)
     return -1;
 
   int task_id = -1;
   if (sscanf(arc_app_id->c_str(), "org.chromium.arc.%d", &task_id) != 1)
     return -1;
 
   return task_id;
 }