Make sure the google wallet in-app payment support app is always installed.

chrome/browser/extensions/api/developer_private/developer_private_api.cc

 // Copyright (c) 2012 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/extensions/api/developer_private/developer_private_api.h"
 
 #include "base/base64.h"
+#include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/i18n/file_util_icu.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/devtools/devtools_window.h"
 #include "chrome/browser/extensions/api/developer_private/developer_private_api_factory.h"
 #include "chrome/browser/extensions/api/developer_private/entry_picker.h"
 #include "chrome/browser/extensions/api/extension_action/extension_action_api.h"
 #include "chrome/browser/extensions/extension_disabled_ui.h"
 #include "chrome/browser/extensions/extension_error_reporter.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/extensions/management_policy.h"
 #include "chrome/browser/extensions/shell_window_registry.h"
 #include "chrome/browser/extensions/unpacked_installer.h"
 #include "chrome/browser/extensions/updater/extension_updater.h"
 #include "chrome/browser/platform_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sync_file_system/drive_file_sync_service.h"
 #include "chrome/browser/ui/chrome_select_file_policy.h"
 #include "chrome/browser/ui/extensions/shell_window.h"
 #include "chrome/browser/ui/webui/extensions/extension_icon_source.h"
+#include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/api/developer_private.h"
 #include "chrome/common/extensions/background_info.h"
 #include "chrome/common/extensions/extension_icon_set.h"
 #include "chrome/common/extensions/incognito_handler.h"
 #include "chrome/common/extensions/manifest_handlers/icons_handler.h"
 #include "chrome/common/extensions/manifest_handlers/offline_enabled_info.h"
 #include "chrome/common/extensions/manifest_url_handler.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
@@ skipping 362 matching lines @@
   for (ExtensionSet::const_iterator iter = items.begin();
        iter != items.end(); ++iter) {
     const Extension& item = **iter;
 
     ExtensionResource item_resource =
         IconsInfo::GetIconResource(&item,
                                    48,
                                    ExtensionIconSet::MATCH_BIGGER);
     id_to_icon[item.id()] = item_resource;
 
-    if (item.location() == Manifest::COMPONENT)
-      continue;  // Skip built-in extensions / apps;
+    // Don't show component extensions because they are only extensions as an
+    // implementation detail of Chrome.
+    if (item.location() == Manifest::COMPONENT &&
+        !CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kShowComponentExtensionOptions)) {
+      continue;
+    }
+
+    // Don't show apps that aren't visible in either launcher or ntp.
+    if (item.is_app() && !item.ShouldDisplayInAppLauncher() &&
+        !item.ShouldDisplayInNewTabPage() &&
+        !Manifest::IsUnpackedLocation(item.location())) {
+      continue;
+    }
+
     item_list.push_back(make_linked_ptr<developer::ItemInfo>(
         CreateItemInfo(
             item, service->IsExtensionEnabled(item.id())).release()));
   }
 
   content::BrowserThread::PostTask(content::BrowserThread::FILE, FROM_HERE,
       base::Bind(&DeveloperPrivateGetItemsInfoFunction::GetIconsOnFileThread,
                  this,
                  item_list,
                  id_to_icon));
@@ skipping 857 matching lines @@
 
   #undef   SET_STRING
   return true;
 }
 
 DeveloperPrivateGetStringsFunction::~DeveloperPrivateGetStringsFunction() {}
 
 } // namespace api
 
 } // namespace extensions