[scheduler] Teach scheduler about audio state

cc/test/ordered_simple_task_runner.cc

 // Copyright 2014 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.
 
 #include "cc/test/ordered_simple_task_runner.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <limits>
@@ skipping 229 matching lines @@
 }
 
 bool OrderedSimpleTaskRunner::RunUntilTime(base::TimeTicks time) {
   // If we are not auto advancing, force now forward to the time.
   if (!advance_now_ && now_src_->NowTicks() < time)
     now_src_->Advance(time - now_src_->NowTicks());
 
   // Run tasks
   bool result = RunTasksWhile(NowBefore(time));
 
+  bool has_reached_task_limit = HasPendingTasks() && NextTaskTime() <= time;
+
   // If the next task is after the stopping time and auto-advancing now, then
   // force time to be the stopping time.
-  if (!result && advance_now_ && now_src_->NowTicks() < time) {
+  if (!has_reached_task_limit && advance_now_ && now_src_->NowTicks() < time) {
     now_src_->Advance(time - now_src_->NowTicks());
   }
 
   return result;
 }
 
 bool OrderedSimpleTaskRunner::RunForPeriod(base::TimeDelta period) {
   return RunUntilTime(now_src_->NowTicks() + period);
 }
 
@@ skipping 73 matching lines @@
 
 bool OrderedSimpleTaskRunner::AdvanceNowCallback() {
   base::TimeTicks next_task_time = NextTaskTime();
   if (now_src_->NowTicks() < next_task_time) {
     now_src_->Advance(next_task_time - now_src_->NowTicks());
   }
   return true;
 }
 
 }  // namespace cc