Added retry support to AttestationPolicyObserver.

chrome/browser/chromeos/attestation/attestation_policy_observer_unittest.cc

Index: chrome/browser/chromeos/attestation/attestation_policy_observer_unittest.cc
diff --git a/chrome/browser/chromeos/attestation/attestation_policy_observer_unittest.cc b/chrome/browser/chromeos/attestation/attestation_policy_observer_unittest.cc
index 31a274f868a3928e3be7cdea6e4157375fde08c9..dd0a07075f7cbc016b165008e631b8f1ed0f2ba9 100644
--- a/chrome/browser/chromeos/attestation/attestation_policy_observer_unittest.cc
+++ b/chrome/browser/chromeos/attestation/attestation_policy_observer_unittest.cc
@@ -75,6 +75,11 @@ void DBusCallbackTrue(const BoolDBusMethodCallback& callback) {
       FROM_HERE, base::Bind(callback, DBUS_METHOD_CALL_SUCCESS, true));
 }
 
+void DBusCallbackError(const BoolDBusMethodCallback& callback) {
+  base::MessageLoop::current()->PostTask(
+      FROM_HERE, base::Bind(callback, DBUS_METHOD_CALL_FAILURE, false));
+}
+
 void CertCallbackSuccess(const AttestationFlow::CertificateCallback& callback) {
   base::MessageLoop::current()->PostTask(
       FROM_HERE, base::Bind(callback, true, "fake_cert"));
@@ -187,6 +192,7 @@ class AttestationPolicyObserverTest : public ::testing::Test {
     AttestationPolicyObserver observer(&policy_client_,
                                        &cryptohome_client_,
                                        &attestation_flow_);
+    observer.set_retry_delay(0);
     base::RunLoop().RunUntilIdle();
   }
 
@@ -288,5 +294,14 @@ TEST_F(AttestationPolicyObserverTest, IgnoreUnknownCertFormat) {
   Run();
 }
 
+TEST_F(AttestationPolicyObserverTest, DBusFailureRetry) {
+  SetupMocks(MOCK_NEW_KEY, "");
+  // Simulate a DBus failure.
+  EXPECT_CALL(cryptohome_client_, TpmAttestationDoesKeyExist(_, _, _))
+      .WillOnce(WithArgs<2>(Invoke(DBusCallbackError)))
+      .WillRepeatedly(WithArgs<2>(Invoke(DBusCallbackFalse)));
+  Run();
+}
+
 }  // namespace attestation
 }  // namespace chromeos