Filter out ARC notifiers that are not shown in launcher.

chrome/browser/notifications/arc_application_notifier_source_chromeos.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/notifications/arc_application_notifier_source_chromeos.h"
 
 #include <set>
 
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 28 matching lines @@
     return std::vector<std::unique_ptr<message_center::Notifier>>();
   }
   const std::vector<std::string>& app_ids = app_list->GetAppIds();
   std::vector<std::unique_ptr<message_center::Notifier>> results;
 
   last_profile_ = profile;
   app_list->AddObserver(this);
 
   for (const std::string& app_id : app_ids) {
     const auto app = app_list->GetApp(app_id);
     if (!app)

[dewittj, 2016/06/30 17:55:27]

nit: combine all these if statements

[hirono, 2016/07/01 07:19:05]

Done.

       continue;
     // Handle packages having multiple launcher activities.
     if (package_to_app_ids_.count(app->package_name))
       continue;
 
+    const auto package = app_list->GetPackage(app->package_name);
+  if (!package || package->system)
+    continue;

[xiyuan, 2016/06/30 14:43:03]

nit: wrong indent ?

[hirono, 2016/07/01 07:19:05]

Done.

+
     // Load icons for notifier.
     std::unique_ptr<ArcAppIcon> icon(
         new ArcAppIcon(profile, app_id,
                        // ARC icon is available only for 48x48 dips.
                        kArcAppIconSizeInDp,
                        // The life time of icon must shorter than |this|.
                        this));
     icon->LoadForScaleFactor(
         ui::GetSupportedScaleFactor(display::Screen::GetScreen()
                                         ->GetPrimaryDisplay()
@@ skipping 55 matching lines @@
 
 void ArcApplicationNotifierSourceChromeOS::StopObserving() {
   if (!last_profile_)
     return;
   ArcAppListPrefs* const app_list = ArcAppListPrefs::Get(last_profile_);
   app_list->RemoveObserver(this);
   last_profile_ = nullptr;
 }
 
 }  // namespace arc