arc: Skip GMS Sign-In in case Android is already signed-in.

chrome/browser/chromeos/arc/arc_auth_context.cc

 // 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/arc/arc_auth_context.h"
 
 #include "base/callback_helpers.h"
 #include "base/strings/stringprintf.h"
+#include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/chromeos/arc/arc_support_host.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/signin/profile_oauth2_token_service_factory.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
+#include "chrome/browser/signin/signin_ui_util.h"
 #include "components/signin/core/browser/profile_oauth2_token_service.h"
 #include "components/signin/core/browser/signin_manager_base.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/storage_partition.h"
 #include "content/public/common/url_constants.h"
 #include "google_apis/gaia/gaia_auth_fetcher.h"
 #include "google_apis/gaia/gaia_constants.h"
 
 namespace arc {
 
@@ skipping 12 matching lines @@
   storage_partition_ = content::BrowserContext::GetStoragePartitionForSite(
       profile, GURL(site_url));
   CHECK(storage_partition_);
 
   // Get token service and account ID to fetch auth tokens.
   token_service_ = ProfileOAuth2TokenServiceFactory::GetForProfile(profile);
   const SigninManagerBase* const signin_manager =
       SigninManagerFactory::GetForProfile(profile);
   CHECK(token_service_ && signin_manager);
   account_id_ = signin_manager->GetAuthenticatedAccountId();
+
+  full_account_id_ = base::UTF16ToUTF8(
+      signin_ui_util::GetAuthenticatedUsername(signin_manager));
 }
 
 ArcAuthContext::~ArcAuthContext() {
   token_service_->RemoveObserver(this);
 }
 
 void ArcAuthContext::Prepare(const PrepareCallback& callback) {
   if (context_prepared_) {
     callback.Run(storage_partition_->GetURLRequestContext());
     return;
@@ skipping 67 matching lines @@
   ResetFetchers();
   base::ResetAndReturn(&callback_).Run(nullptr);
 }
 
 void ArcAuthContext::ResetFetchers() {
   merger_fetcher_.reset();
   ubertoken_fetcher_.reset();
 }
 
 }  // namespace arc