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

chromeos/login/auth/user_context.cc

Index: chromeos/login/auth/user_context.cc
diff --git a/chromeos/login/auth/user_context.cc b/chromeos/login/auth/user_context.cc
index 4f51b34ef7ceec7bbdf9eabb3549ba85b2293025..e5b3fe0951949df8a3a14685971a20c757e66721 100644
--- a/chromeos/login/auth/user_context.cc
+++ b/chromeos/login/auth/user_context.cc
@@ -25,7 +25,8 @@ UserContext::UserContext(const UserContext& other)
       auth_flow_(other.auth_flow_),
       user_type_(other.user_type_),
       public_session_locale_(other.public_session_locale_),
-      public_session_input_method_(other.public_session_input_method_) {
+      public_session_input_method_(other.public_session_input_method_),
+      device_id_(other.device_id_) {
 }
 
 UserContext::UserContext(const std::string& user_id)