Refactor TimeDomain::MaybeAdvanceTime in preparation for DoWork deduping

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

Index: third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
diff --git a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
index 53b95608089341615c3bcaf7ed958a35eb90907d..37c331fbe8eb9427cc835f50f392b5631d4d110b 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
+++ b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
@@ -176,23 +176,27 @@ class BLINK_PLATFORM_EXPORT TaskQueueManager
 
   // Delayed Tasks with run_times <= Now() are enqueued onto the work queue and
   // reloads any empty work queues.
-  void UpdateWorkQueues(LazyNow lazy_now);
+  void UpdateWorkQueues(LazyNow* lazy_now);
 
   // Chooses the next work queue to service. Returns true if |out_queue|
   // indicates the queue from which the next task should be run, false to
   // avoid running any tasks.
   bool SelectWorkQueueToService(internal::WorkQueue** out_work_queue);
 
-  // Runs a single nestable task from the |queue|. On exit, |out_task| will
-  // contain the task which was executed. Non-nestable task are reposted on the
-  // run loop. The queue must not be empty.
   enum class ProcessTaskResult {
     DEFERRED,
     EXECUTED,
     TASK_QUEUE_MANAGER_DELETED
   };
+
+  // Runs a single nestable task from the |queue|. On exit, |out_task| will
+  // contain the task which was executed. Non-nestable task are reposted on the
+  // run loop. The queue must not be empty.  On exit |time_after_task| may get
+  // set (not guaranteed), sampling |real_time_domain()->Now()| immediately
+  // after running the task.
   ProcessTaskResult ProcessTaskFromWorkQueue(internal::WorkQueue* work_queue,
-                                             LazyNow*);
+                                             LazyNow time_before_task,
+                                             base::TimeTicks* time_after_task);
 
   bool RunsTasksOnCurrentThread() const;
   bool PostNonNestableDelayedTask(const tracked_objects::Location& from_here,
@@ -201,9 +205,9 @@ class BLINK_PLATFORM_EXPORT TaskQueueManager
 
   internal::EnqueueOrder GetNextSequenceNumber();
 
-  // Calls MaybeAdvanceTime on all time domains and returns true if one of them
-  // was able to advance.
-  bool TryAdvanceTimeDomains();
+  // Calls DelayTillNextTask on all time domains and returns the smallest delay
+  // requested if any.
+  base::Optional<base::TimeDelta> ComputeDelayTillNextTask(LazyNow* lazy_now);
 
   void MaybeRecordTaskDelayHistograms(
       const internal::TaskQueueImpl::Task& pending_task,