Let Ubertoken Fetch be primed with an access token.

chrome/browser/chromeos/login/signin/oauth2_login_verifier.cc

Index: chrome/browser/chromeos/login/signin/oauth2_login_verifier.cc
diff --git a/chrome/browser/chromeos/login/signin/oauth2_login_verifier.cc b/chrome/browser/chromeos/login/signin/oauth2_login_verifier.cc
index a9dbd356fb5924e588b6b4393a3704f2cc0d9c47..574cd8f30e34179916c0aa0c5f0fabf77f10fdf4 100644
--- a/chrome/browser/chromeos/login/signin/oauth2_login_verifier.cc
+++ b/chrome/browser/chromeos/login/signin/oauth2_login_verifier.cc
@@ -52,10 +52,8 @@ void OAuth2LoginVerifier::VerifyUserCookies(Profile* profile) {
 
 void OAuth2LoginVerifier::VerifyProfileTokens(Profile* profile) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
-
-  // TODO(xiyuan,mlerman): Use |access_token_| to cut down one round trip.
-  // See http://crbug.com/483596
-  cookie_manager_service_->AddAccountToCookie(primary_account_id_);
+  cookie_manager_service_->AddAccountToCookieWithToken(primary_account_id_,
+                                                       access_token_);

[xiyuan, 2015/05/19 20:15:30]

Sorry, missed this.

|access_token_| could be empty. So we need to selectively call
AddAccountToCookie and AddAccountToCookieWithToken. :p

[Mike Lerman, 2015/05/20 15:33:07]

Ah, I thought there always was one. Thanks! Done.

 }
 
 void OAuth2LoginVerifier::OnAddAccountToCookieCompleted(