arc: Add Arc Kiosk app service and ability to launch kiosk apps.

chrome/browser/chromeos/app_mode/arc/arc_kiosk_app_service.cc

Index: chrome/browser/chromeos/app_mode/arc/arc_kiosk_app_service.cc
diff --git a/chrome/browser/chromeos/app_mode/arc/arc_kiosk_app_service.cc b/chrome/browser/chromeos/app_mode/arc/arc_kiosk_app_service.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7b56ae3cf1c3ff0af96d76ff180438c0c0b85048
--- /dev/null
+++ b/chrome/browser/chromeos/app_mode/arc/arc_kiosk_app_service.cc
@@ -0,0 +1,121 @@
+// 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/chromeos/app_mode/arc/arc_kiosk_app_service.h>
+
+#include "chrome/browser/chromeos/app_mode/arc/arc_kiosk_app_service_factory.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/browser/ui/app_list/arc/arc_app_utils.h"
+#include "chrome/browser/ui/ash/multi_user/multi_user_util.h"
+#include "chrome/common/pref_names.h"
+#include "components/prefs/pref_service.h"
+
+namespace chromeos {
+
+ArcKioskAppService* ArcKioskAppService::Create(Profile* profile,
+                                               ArcAppListPrefs* prefs) {
+  return new ArcKioskAppService(profile, prefs);
+}
+
+ArcKioskAppService* ArcKioskAppService::Get(content::BrowserContext* context) {
+  return ArcKioskAppServiceFactory::GetForBrowserContext(context);
+}
+
+void ArcKioskAppService::OnAppRegistered(
+    const std::string& app_id,
+    const ArcAppListPrefs::AppInfo& app_info) {
+  if (app_id == app_id_) {
+    MaybeStartOrStopKioskApp();
+  }
+}
+
+void ArcKioskAppService::OnAppReadyChanged(const std::string& id, bool ready) {
+  if (id == app_id_) {
+    MaybeStartOrStopKioskApp();
+  }
+}
+
+void ArcKioskAppService::OnPackageListInitialRefreshed() {
+  // The app could already be registered.
+  app_id_ = GetAppId();
+  MaybeStartOrStopKioskApp();
+}
+
+void ArcKioskAppService::OnArcKioskAppsChanged() {
+  app_id_ = GetAppId();
+  MaybeStartOrStopKioskApp();
+}
+
+void ArcKioskAppService::OnTaskCreated(int32_t task_id,
+                                       const std::string& package_name,
+                                       const std::string& activity) {
+  // Store task id of the app to stop it later when needed.
+  if (app_info_ && package_name == app_info_->package_name &&
+      activity == app_info_->activity)
+    task_id_ = task_id;
+}
+
+void ArcKioskAppService::OnTaskDestroyed(int32_t task_id) {
+  if (task_id == task_id_) {
+    app_launcher_.reset();
+    task_id_ = -1;
+  }
+}
+
+ArcKioskAppService::ArcKioskAppService(Profile* profile, ArcAppListPrefs* prefs)
+    : profile_(profile), prefs_(prefs) {
+  if (prefs_)
+    prefs_->AddObserver(this);
+  app_manager_ = ArcKioskAppManager::Get();
+  if (app_manager_) {
+    app_manager_->AddObserver(this);
+    app_id_ = GetAppId();
+  }
+  pref_change_registrar_.reset(new PrefChangeRegistrar());
+  pref_change_registrar_->Init(profile_->GetPrefs());
+  // Try to start/stop kiosk app on policy compliance state change.
+  pref_change_registrar_->Add(
+      prefs::kArcPolicyCompliant,
+      base::Bind(&ArcKioskAppService::MaybeStartOrStopKioskApp,
+                 base::Unretained(this)));
+  MaybeStartOrStopKioskApp();
+}
+
+ArcKioskAppService::~ArcKioskAppService() {
+  if (prefs_) {
+    prefs_->RemoveObserver(this);
+  }
+  if (app_manager_) {
+    app_manager_->RemoveObserver(this);
+  }
+}
+
+void ArcKioskAppService::MaybeStartOrStopKioskApp() {
+  app_info_ = std::move(prefs_->GetApp(app_id_));
+  if (app_info_ && app_info_->ready &&
+      profile_->GetPrefs()->GetBoolean(prefs::kArcPolicyCompliant)) {

[Nikita (slow), 2016/11/16 15:33:28]

nit: Same comment about policy compliance.
On ARC++ managing app will most likely always return that we're compliant.

[Sergey Poromov, 2016/11/16 15:54:09]

This pref tracks whether ARC++ reported or not that it's compliant.
Also there might be cases when applying policies failed and that means that the
app shouldn't be started or even stopped if running.

+    if (!app_launcher_) {
+      app_launcher_.reset(new ArcKioskAppLauncher(profile_, app_id_));
+    }
+  } else if (task_id_ != -1) {
+    arc::CloseTask(task_id_);
+  }
+}
+
+std::string ArcKioskAppService::GetAppId() {
+  AccountId account_id = multi_user_util::GetAccountIdFromProfile(profile_);
+  const ArcKioskAppManager::ArcKioskApp* app =
+      app_manager_->GetAppByAccountId(account_id);
+  if (app) {
+    std::unordered_set<std::string> app_ids =
+        prefs_->GetAppsForPackage(app->app_info().package_name());
+    if (!app_ids.empty()) {
+      // TODO(poromov@): Choose appropriate app id to launch

[Nikita (slow), 2016/11/16 15:33:28]

nit: bug #?

[Sergey Poromov, 2016/11/16 15:54:09]

Done.

+      return std::string(*app_ids.begin());
+    }
+  }
+  return std::string();
+}
+}  // namespace chromeos