Pass Device ID in the oauth2/token request. Keep Device ID in local state on Chrome OS.

chrome/browser/chromeos/login/session/user_session_manager.cc

Index: chrome/browser/chromeos/login/session/user_session_manager.cc
diff --git a/chrome/browser/chromeos/login/session/user_session_manager.cc b/chrome/browser/chromeos/login/session/user_session_manager.cc
index 9018d8ac251dd61e89245bdd31e8ae7f35f6c1c0..03efb2cba9af0c2a4dea29d7dfe61dea487f02a1 100644
--- a/chrome/browser/chromeos/login/session/user_session_manager.cc
+++ b/chrome/browser/chromeos/login/session/user_session_manager.cc
@@ -423,6 +423,11 @@ void UserSessionManager::StartSession(
   // TODO(nkostylev): Notify UserLoggedIn() after profile is actually
   // ready to be used (http://crbug.com/361528).
   NotifyUserLoggedIn();
+
+  if (!user_context_.GetDeviceId().empty())

[pavely, 2015/05/13 00:05:52]

nit: Consider using user_context instead of user_context_? From reading just
this function it is not clear where user_context got copied into user_context_
(I know it happened in CreateUserSession)

[dzhioev (left Google), 2015/05/13 20:24:22]

Done.

+    user_manager::UserManager::Get()->SetKnownUserDeviceId(
+        user_context_.GetUserID(), user_context_.GetDeviceId());
+
   PrepareProfile();
 }
 
@@ -896,20 +901,6 @@ void UserSessionManager::InitProfilePreferences(
     ChromeUserManager::Get()->SetIsCurrentUserNew(true);
   }
 
-  std::string device_id = profile->GetPrefs()->GetString(
-      prefs::kGoogleServicesSigninScopedDeviceId);
-  if (device_id.empty()) {
-    device_id = user_context.GetDeviceId();
-    if (!device_id.empty()) {
-      profile->GetPrefs()->SetString(prefs::kGoogleServicesSigninScopedDeviceId,
-                                     device_id);
-    }
-  }
-  if (!device_id.empty()) {
-    user_manager::UserManager::Get()->SetKnownUserDeviceId(user->GetUserID(),
-                                                           device_id);
-  }
-
   if (user->is_active()) {
     input_method::InputMethodManager* manager =
         input_method::InputMethodManager::Get();