[cros] Modify oobe/login tests to work with webview

chrome/browser/chromeos/policy/login_policy_test_base.h

Index: chrome/browser/chromeos/policy/login_policy_test_base.h
diff --git a/chrome/browser/chromeos/policy/login_policy_test_base.h b/chrome/browser/chromeos/policy/login_policy_test_base.h
index cf4f8480dcc7c173ea7a57bd57af19ff618ea427..c99f97654f040667d37e73750c53fbed63eac0f6 100644
--- a/chrome/browser/chromeos/policy/login_policy_test_base.h
+++ b/chrome/browser/chromeos/policy/login_policy_test_base.h
@@ -23,7 +23,10 @@ class LocalPolicyTestServer;
 
 // This class can be used to implement tests which need policy to be set prior
 // to login.
-class LoginPolicyTestBase : public chromeos::OobeBaseTest {
+// Boolean parameter is used to run this test for webview (true) and for
+// iframe (false) GAIA sign in.
+class LoginPolicyTestBase : public chromeos::OobeBaseTest,
+                            public testing::WithParamInterface<bool> {
  protected:
   LoginPolicyTestBase();
   ~LoginPolicyTestBase() override;