[package:vm_service] Add kTimerSignificantlyOverdue field to EventKind

I overlooked making this additon earlier. This CL also prepares
`package:vm_service 15.0.2` to be published.

TEST=CI

Change-Id: I4d28d87c027d27c4e532e5608f57b62eaa290e44
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/433082
Reviewed-by: Ben Konyi <[email protected]>
Commit-Queue: Derek Xu <[email protected]>

Author: derekxu16

pkg/vm_service/CHANGELOG.md

@@ -1,7 +1,9 @@
+## 15.0.2
+- Add `kTimerSignificantlyOverdue` field to `EventKind`.
+
 ## 15.0.1
 - Update to version `4.19` of the spec.
 - Add `Timer` stream.
-- Add `TimerSignificantlyOverdue` event kind.
 - Add `details` property to `Event`.
 - Add `getQueuedMicrotasks` RPC.
 - Add `Microtask` and `QueuedMicrotasks` types.

pkg/vm_service/lib/src/vm_service.dart

@@ -2412,6 +2412,9 @@ abstract class EventKind {
   /// Event from dart:developer.log.
   static const String kLogging = 'Logging';
 
+  /// A timer fired significantly later than expected.
+  static const String kTimerSignificantlyOverdue = 'TimerSignificantlyOverdue';
+
   /// A block of timeline events has been completed.
   ///
   /// This service event is not sent for individual timeline events. It is

pkg/vm_service/pubspec.yaml

@@ -1,5 +1,5 @@
 name: vm_service
-version: 15.0.1
+version: 15.0.2
 description: >-
   A library to communicate with a service implementing the Dart VM
   service protocol.

runtime/vm/service/service.md

@@ -2781,6 +2781,9 @@ enum EventKind {
   // Event from dart:developer.log.
   Logging,
 
+  // A timer fired significantly later than expected.
+  TimerSignificantlyOverdue,
+
   // A block of timeline events has been completed.
   //
   // This service event is not sent for individual timeline events. It is