arc: Enable silent PlayStore Sign-In.

chrome/browser/chromeos/arc/arc_auth_service.cc

Index: chrome/browser/chromeos/arc/arc_auth_service.cc
diff --git a/chrome/browser/chromeos/arc/arc_auth_service.cc b/chrome/browser/chromeos/arc/arc_auth_service.cc
index 20c6bde299bf4c483288f613ec66195fb6ab04f6..d4e2a5618cde71c3e635700608710ec3a6d1be56 100644
--- a/chrome/browser/chromeos/arc/arc_auth_service.cc
+++ b/chrome/browser/chromeos/arc/arc_auth_service.cc
@@ -791,6 +791,19 @@ void ArcAuthService::OnPrepareContextFailed() {
   UpdateOptInCancelUMA(OptInCancelReason::NETWORK_ERROR);
 }
 
+void ArcAuthService::OnAuthCodeRequested(const std::string& auth_code) {
+  SetAuthCodeAndStartArc(auth_code);
+}
+
+void ArcAuthService::OnAuthCodeFailed() {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  DCHECK_EQ(state_, State::FETCHING_CODE);
+  ShutdownBridgeAndShowUI(
+      UIPage::ERROR,
+      l10n_util::GetStringUTF16(IDS_ARC_SERVER_COMMUNICATION_ERROR));
+  UpdateOptInCancelUMA(OptInCancelReason::NETWORK_ERROR);
+}
+
 void ArcAuthService::CheckAndroidManagement(bool background_mode) {
   // Do not send requests for Chrome OS managed users.
   if (IsAccountManaged(profile_)) {
@@ -840,13 +853,26 @@ void ArcAuthService::OnAndroidManagementChecked(
 }
 
 void ArcAuthService::StartArcIfSignedIn() {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   if (state_ == State::ACTIVE)
     return;
+
   if (profile_->GetPrefs()->GetBoolean(prefs::kArcSignedIn) ||
       IsOptInVerificationDisabled()) {
     StartArc();
   } else {
-    ShowUI(UIPage::LSO_PROGRESS, base::string16());
+    const base::CommandLine* command_line =
+        base::CommandLine::ForCurrentProcess();
+    std::string auth_endpoint;
+    if (command_line->HasSwitch(chromeos::switches::kArcUseAuthEndpoint)) {
+      auth_endpoint = command_line->GetSwitchValueASCII(
+          chromeos::switches::kArcUseAuthEndpoint);
+    }
+
+    if (!auth_endpoint.empty())
+      context_->FetchAuthCode(auth_endpoint);
+    else
+      ShowUI(UIPage::LSO_PROGRESS, base::string16());
   }
 }