Introduce lock screen app manager interface

chrome/browser/chromeos/lock_screen_apps/app_manager_impl.cc

+// Copyright 2017 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/lock_screen_apps/app_manager_impl.h"
+
+#include "chrome/browser/chromeos/profiles/profile_helper.h"
+
+namespace lock_screen_apps {
+
+AppManagerImpl::AppManagerImpl() = default;
+
+AppManagerImpl::~AppManagerImpl() = default;
+
+void AppManagerImpl::Initialize(Profile* primary_profile,
+                                Profile* lock_screen_profile) {
+  DCHECK(primary_profile);
+  DCHECK(lock_screen_profile);
+  DCHECK_NE(primary_profile, lock_screen_profile);
+  // Do not use OTR profile for lock screen apps. This is important for
+  // profile usage in |LaunchNoteTaking| - lock screen app background page runs
+  // in original, non off the record profile, so the launch event has to be
+  // dispatched to that profile. For other |lock_screen_profile_|, it makes no
+  // difference - the profile is used to get browser context keyed services, all
+  // of which redirect OTR profile to the original one.
+  DCHECK(!lock_screen_profile->IsOffTheRecord());
+
+  CHECK(!chromeos::ProfileHelper::Get()->GetUserByProfile(lock_screen_profile))
+      << "Lock screen profile should not be associated with any users.";
+
+  primary_profile_ = primary_profile;
+  lock_screen_profile_ = lock_screen_profile;
+}
+
+void AppManagerImpl::Start(const base::Closure& note_taking_changed_callback) {
+  note_taking_changed_callback_ = note_taking_changed_callback;
+}
+
+void AppManagerImpl::Stop() {}
+
+bool AppManagerImpl::IsNoteTakingAppAvailable() const {
+  return false;
+}
+
+std::string AppManagerImpl::GetNoteTakingAppId() const {
+  return std::string();
+}
+
+bool AppManagerImpl::LaunchNoteTaking() {
+  return false;
+}
+
+}  // namespace lock_screen_apps