Revert of Revert of Inline sign in extracts gaia id from HTTP header and seeds account tracker

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 31113f1311b51007ed890e72b35be4721a3a3be7..edeb24ea7924345a44656b4f294543c5094580be 100644
--- a/chromeos/login/auth/user_context.cc
+++ b/chromeos/login/auth/user_context.cc
@@ -15,6 +15,7 @@
 
 UserContext::UserContext(const UserContext& other)
     : user_id_(other.user_id_),
+      gaia_id_(other.gaia_id_),
       key_(other.key_),
       auth_code_(other.auth_code_),
       user_id_hash_(other.user_id_hash_),
@@ -48,6 +49,7 @@
 
 bool UserContext::operator==(const UserContext& context) const {
   return context.user_id_ == user_id_ &&
+         context.gaia_id_ == gaia_id_ &&
          context.key_ == key_ &&
          context.auth_code_ == auth_code_ &&
          context.user_id_hash_ == user_id_hash_ &&
@@ -64,6 +66,10 @@
 
 const std::string& UserContext::GetUserID() const {
   return user_id_;
+}
+
+const std::string& UserContext::GetGaiaID() const {
+  return gaia_id_;
 }
 
 const Key* UserContext::GetKey() const {
@@ -111,6 +117,10 @@
   user_id_ = login::CanonicalizeUserID(user_id);
 }
 
+void UserContext::SetGaiaID(const std::string& gaia_id) {
+  gaia_id_ = gaia_id;
+}
+
 void UserContext::SetKey(const Key& key) {
   key_ = key;
 }