[CrOS] Show extensions that can use file_handlers in Files app.

chrome/browser/chromeos/file_manager/file_tasks.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/chromeos/file_manager/file_tasks.h"
 
 #include "apps/launcher.h"
 #include "base/bind.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/chromeos/drive/file_system_util.h"
 #include "chrome/browser/chromeos/drive/file_task_executor.h"
 #include "chrome/browser/chromeos/file_manager/app_id.h"
 #include "chrome/browser/chromeos/file_manager/file_browser_handlers.h"
 #include "chrome/browser/chromeos/file_manager/fileapi_util.h"
 #include "chrome/browser/chromeos/file_manager/open_util.h"
 #include "chrome/browser/drive/drive_api_util.h"
 #include "chrome/browser/drive/drive_app_registry.h"
 #include "chrome/browser/extensions/extension_tab_util.h"
 #include "chrome/browser/extensions/extension_util.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/extensions/application_launch.h"
 #include "chrome/browser/ui/webui/extensions/extension_icon_source.h"
 #include "chrome/common/extensions/api/file_browser_handlers/file_browser_handler.h"
 #include "chrome/common/extensions/api/file_manager_private.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/pref_names.h"
 #include "extensions/browser/extension_host.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/browser/extension_util.h"
 #include "extensions/common/constants.h"
@@ skipping 331 matching lines @@
   DCHECK(result_list);
 
   const extensions::ExtensionSet& enabled_extensions =
       extensions::ExtensionRegistry::Get(profile)->enabled_extensions();
   for (extensions::ExtensionSet::const_iterator iter =
            enabled_extensions.begin();
        iter != enabled_extensions.end();
        ++iter) {
     const Extension* extension = iter->get();
 
-    // We don't support using hosted apps to open files.
-    if (!extension->is_platform_app())
+    // Check that the extension can be launched via an event. This includes all
+    // platform apps plus whitelisted extensions.
+    if (!CanLaunchViaEvent(extension))
       continue;
 
     // Ephemeral apps cannot be file handlers.
     if (extensions::util::IsEphemeralApp(extension->id(), profile))
       continue;
 
     if (profile->IsOffTheRecord() &&
         !extensions::util::IsIncognitoEnabled(extension->id(), profile))
       continue;
 
@@ skipping 130 matching lines @@
     DCHECK(!task->is_default());
     if (IsFallbackFileHandler(task->task_descriptor())) {
       task->set_is_default(true);
       return;
     }
   }
 }
 
 }  // namespace file_tasks
 }  // namespace file_manager