Add Platform Verification Mojo Services.

media/mojo/interfaces/platform_verification.mojom

+// Copyright 2015 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.
+
+module media.interfaces;
+
+// Allows platform verification for the content protection use case.
+interface PlatformVerification {
+  ChallengePlatform(string service_id, string challenge) =>

[DaleCurtis, 2015/05/06 00:28:28]

Bit light on the interface details? :)

[Darren Krahn, 2015/05/06 19:02:41]

+1 -- I'm not sure if there are style guidelines for mojo interfaces but
something like C++ class method documentation would be good.

[xhwang, 2015/05/07 00:27:37]

Done.

+      (string? signed_data,
+       string? signed_data_signature,
+       string? platform_key_certificate);

[Darren Krahn, 2015/05/06 19:02:41]

What about operation status in the case of a failure? There are legitimate
failure cases like the user refusing Verified Access.

[xhwang, 2015/05/07 00:27:37]

Done.

+};