Motown: Use new TimelineTransform and related definitions

mojo/services/media/common/interfaces/timelines.mojom

 // Copyright 2016 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;
 
 // TODO(dalesat): Move out of media to somewhere more generic.
 
+// Used as a placefolder for unspecified time values.
+const int64 kUnspecifiedTime = 0x7fffffffffffffff;
+
 // Represents the relationship between and subject timeline and a reference
 // timeline.
 //
 // To translate a reference timeline value r to the subject timeline, apply
 // the following formula:
 //
 //   (r - reference_time) * subject_delta / reference_delta + subject_time
 //
 // To translate a subject timeline value s to the reference timeline, apply
 // this formula provided subject_delta isn't zero:
@@ skipping 10 matching lines @@
   // The change in the reference timeline corresponding to subject_delta.
   // Cannnot be zero.
   uint32 reference_delta = 1;
 
   // The change in the subject timeline corresponding to reference_delta.
   uint32 subject_delta = 0;
 };
 
 // A push-mode consumer of timeline updates.
 interface TimelineConsumer {
-  const int64 kUnspecifiedTime = 0x7fffffffffffffff;
-
   // Sets the timeline transform at the indicated effective time. Exactly one
   // of the effective_*_time values must be kUnspecifiedTime.
   // effective_subject_time can only be specified if the current subject_delta
   // isn’t zero. reference_delta may not be zero. subject_time may be
   // kUnspecifiedTime to indicate that the new transform subject_time should
   // be inferred from the effective time. The new transform reference_time is
   // always inferred from the effective time. The callback is called at the
   // effective time or when a pending operation is cancelled due to a
   // subsequent call, in which case the 'completed' value is false.
   SetTimelineTransform(
       int64 subject_time,
       uint32 reference_delta,
       uint32 subject_delta,
       int64 effective_reference_time,
       int64 effective_subject_time) => (bool completed);
 };