Introduce lock screen app manager

chrome/browser/chromeos/note_taking_helper.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_NOTE_TAKING_HELPER_H_
 #define CHROME_BROWSER_CHROMEOS_NOTE_TAKING_HELPER_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 140 matching lines @@
     launch_chrome_app_callback_ = callback;
   }
 
   // Adds or removes an observer.
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
   // Returns a list of available note-taking apps.
   std::vector<NoteTakingAppInfo> GetAvailableApps(Profile* profile);
 
+  // Returns the preferred app info, if the preferred app exists and is a Chrome
+  // app.
+  std::unique_ptr<NoteTakingAppInfo> GetPreferredChromeAppInfo(
+      Profile* profile);
+
   // Sets the preferred note-taking app. |app_id| is a value from a
   // NoteTakingAppInfo object.
   void SetPreferredApp(Profile* profile, const std::string& app_id);
 
   // Returns true if an app that can be used to take notes is available. UI
   // surfaces that call LaunchAppForNewNote() should be hidden otherwise.
   bool IsAppAvailable(Profile* profile);
 
   // Launches the note-taking app to create a new note, optionally additionally
   // passing a file (|path| may be empty). IsAppAvailable() must be called
@@ skipping 79 matching lines @@
   content::NotificationRegistrar registrar_;
 
   base::WeakPtrFactory<NoteTakingHelper> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NoteTakingHelper);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_NOTE_TAKING_HELPER_H_