Mojom updates for Motown.

mojo/services/media/common/interfaces/media_clock.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.
+
+[DartPackage="mojo_services"]
+module mojo.media;
+
+// Expresses a component's disposition with respect to being a clock master or
+// slave.

[jeffbrown, 2015/12/10 20:00:59]

There are a lot of different shades here.  Do we need them all today?

[dalesat, 2015/12/10 22:33:38]

All the clock stuff is speculative right now, but I think this is a pretty good
guess as to what we'll need. I felt like it was OK to capture this thinking now
given that we're nowhere close to a complete system. This can always change down
the road.

+enum ClockDisposition {
+  // Clocks are irrelevant. Component will produce/consume on demand.
+  PASSIVE,
+
+  // Component must slave to a master clock.
+  SLAVE,
+
+  // Component can be master or slave, but being slave is preferred.
+  PREFER_SLAVE,
+
+  // Component can be master or slave, doesn't care which.
+  INDIFFERENT,
+
+  // Component can be master or slave, but master is preferred.
+  PREFER_MASTER,
+
+  // Component must be master and cannot slave to a master clock.
+  MASTER
+};
+
+interface Clock {
+  // TODO(dalesat): Define this.
+};