Finished implementing AttestationPolicyObserver.

chrome/browser/chromeos/attestation/attestation_key_payload.proto

Index: chrome/browser/chromeos/attestation/attestation_key_payload.proto
diff --git a/chrome/browser/chromeos/attestation/attestation_key_payload.proto b/chrome/browser/chromeos/attestation/attestation_key_payload.proto
new file mode 100644
index 0000000000000000000000000000000000000000..d604f70dfbcb104f95d57d0ecade51fedf9b14bf
--- /dev/null
+++ b/chrome/browser/chromeos/attestation/attestation_key_payload.proto
@@ -0,0 +1,16 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+syntax = "proto2";
+
+option optimize_for = LITE_RUNTIME;
+
+package chromeos.attestation;
+
+message AttestationKeyPayload {
+  // Whether the key's certificate has been uploaded.  This is used for
+  // Enterprise Machine Keys to determine if the certificate has been uploaded
+  // to DMServer.
+  optional bool is_certificate_uploaded = 1;
+}