scheduler: Ensure consistent delayed task ordering between task queues

third_party/WebKit/Source/platform/scheduler/base/time_domain.h

Index: third_party/WebKit/Source/platform/scheduler/base/time_domain.h
diff --git a/third_party/WebKit/Source/platform/scheduler/base/time_domain.h b/third_party/WebKit/Source/platform/scheduler/base/time_domain.h
index c2b828a8bddf288660b917a7d94825b0122c0491..2cc9b65cc58fca7f93e7e0181f204539bbadaed9 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/time_domain.h
+++ b/third_party/WebKit/Source/platform/scheduler/base/time_domain.h
@@ -95,6 +95,7 @@ class BLINK_PLATFORM_EXPORT TimeDomain {
   // registered wakeup for |queue|.
   void ScheduleDelayedWork(internal::TaskQueueImpl* queue,
                            base::TimeTicks delayed_run_time,
+                           int sequence_num,
                            base::TimeTicks now);
 
   // Cancels any scheduled calls to TaskQueueImpl::WakeUpForDelayedWork for
@@ -139,11 +140,14 @@ class BLINK_PLATFORM_EXPORT TimeDomain {
  private:
   struct DelayedWakeup {
     base::TimeTicks time;
+    int sequence_num;
     internal::TaskQueueImpl* queue;
 
     bool operator<=(const DelayedWakeup& other) const {
-      if (time == other.time)
-        return queue <= other.queue;
+      if (time == other.time) {
+        DCHECK_NE(sequence_num, other.sequence_num);
+        return (sequence_num - other.sequence_num) < 0;
+      }
       return time < other.time;
     }