Adds a new checkbox for backup and restore in opt-in flow.

chrome/browser/chromeos/arc/arc_support_host.cc

Index: chrome/browser/chromeos/arc/arc_support_host.cc
diff --git a/chrome/browser/chromeos/arc/arc_support_host.cc b/chrome/browser/chromeos/arc/arc_support_host.cc
index 3713eb058dab9ea26329320fbb9e032a40d6dcb9..5b0ee1a4caf0d009aeb9d78aa7e5bb0305393e41 100644
--- a/chrome/browser/chromeos/arc/arc_support_host.cc
+++ b/chrome/browser/chromeos/arc/arc_support_host.cc
@@ -19,6 +19,7 @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/ash/multi_user/multi_user_util.h"
 #include "chrome/browser/ui/browser_commands.h"
+#include "chrome/common/pref_names.h"
 #include "chrome/grit/generated_resources.h"
 #include "components/metrics/metrics_pref_names.h"
 #include "components/prefs/pref_service.h"
@@ -43,6 +44,7 @@ const char kActionCancelAuthCode[] = "cancelAuthCode";
 const char kActionSetAuthCode[] = "setAuthCode";
 const char kActionEnableMetrics[] = "enableMetrics";
 const char kActionSendFeedback[] = "sendFeedback";
+const char kActionEnableBackupRestore[] = "enableBackupRestore";
 const char kActionCloseUI[] = "closeUI";
 const char kActionShowPage[] = "showPage";
 }  // namespace
@@ -98,7 +100,6 @@ void ArcSupportHost::Start(Client* client) {
 
 void ArcSupportHost::Initialize() {
   DCHECK(client_);
-
   std::unique_ptr<base::DictionaryValue> localized_strings(
       new base::DictionaryValue());
   base::string16 device_name = ash::GetChromeOSDeviceName();
@@ -133,6 +134,9 @@ void ArcSupportHost::Initialize() {
   localized_strings->SetString(
       "termsOfService",
       l10n_util::GetStringUTF16(IDS_ARC_OPT_IN_DIALOG_TERMS_OF_SERVICE));
+  localized_strings->SetString(
+      "textBackupRestore",
+      l10n_util::GetStringUTF16(IDS_ARC_OPT_IN_DIALOG_BACKUP_RESTORE));
 
   const std::string& app_locale = g_browser_process->GetApplicationLocale();
   const std::string& country_code = base::CountryCodeForCurrentTimezone();
@@ -219,6 +223,11 @@ void ArcSupportHost::EnableMetrics() {
   InitiateMetricsReportingChange(true, OnMetricsReportingCallbackType());
 }
 
+void ArcSupportHost::EnableBackupRestore() {
+  PrefService* pref_service = arc::ArcAuthService::Get()->profile()->GetPrefs();
+  pref_service->SetBoolean(prefs::kArcBackupRestoreEnabled, true);
+}
+
 void ArcSupportHost::OnMessage(const std::string& request_string) {
   std::unique_ptr<base::Value> request_value =
       base::JSONReader::Read(request_string);
@@ -252,6 +261,8 @@ void ArcSupportHost::OnMessage(const std::string& request_string) {
     EnableMetrics();
   } else if (action == kActionSendFeedback) {
     chrome::OpenFeedbackDialog(nullptr);
+  } else if (action == kActionEnableBackupRestore) {
+    EnableBackupRestore();
   } else {
     NOTREACHED();
   }